1221湛江一中学年度第一学期期终考试
广东省湛江市第一中学高一数学上学期期中试题(1)
广东省湛江市第一中学2021-2021学年高一数学上学期期中试题一、选择题：（本大题共10个小题，每题5分，总分值50分．在每题给出的四个选项中，只有一项为哪一项符合题目要求的）1. 设集合{}21,A x x k k Z ==+∈,5a =，那么有A ．∈a AB ．-∉a AC ．{}∈a AD ．{}⊇a A2.设⎭⎬⎫⎩⎨⎧-∈3,21,1,1α，那么使函数αx y =的概念域为R 且为奇函数的所有α的值为 A ．1 ，3 B ．1- ，1 C ．1- ，3 D ．1- ，1 33.设()833-+=x x f x ,用二分法求方程()2,10833在=-+x x 内近似解的进程中得()()(),025.1,05.1,01<><f f f 那么据此可得该方程的有解区间是A ．(1,1.25)B ．(1.25,1.5)C ．(1.5,2)D ．不能确信4.以下各组函数中，表示同一个函数的是A ．1,x y y x== B ． y y ==C ．,log (0,1)x a y x y a a a ==>≠D ． 2,y x y ==5.已知67.0=a ，7.06=b ，6log 7.0=c ，那么c b a ,,的大小关系为A. b c a <<B. c b a <<C. a b c <<D. b a c <<6.函数⎩⎨⎧≤>=0,30,log )(2x x x x f x ，那么)]1([f f = A.0 B.31 C.1 D.3 7.假设函数)(x f y =是函数x a y = 0(>a ，且)1≠a 的反函数，其图象通过点a (，a )，那么=)(x f A. x 2log B. x 21log C. x -2 D. 2x 8.函数x x x f 4)(2-=在以下哪个区间上单调递增A.)2,(-∞B. ),2(+∞C. ),4()0,(+∞⋃-∞D. ),4(+∞9.假设函数()log ()a f x x b =+（其中,a b 为常数）的图象如右图所示，那么函数()x g x a b =+ 的大致图象是10.如图，点P 在边长为1的正方形ABCD 的边界上运动，设M 是CDM C B A ,,,匀速度运动时，点P 通过的路程x 为自变量，三角形APM 的面积为y 是二、填空题（本大题共4个小题，每题5分，总分值20分）11. 函数12y x=-的概念域为 12．已知9)(3+=ax x f )(R a ∈，,3)2(=-f 则=)2(f 13．函数()()0,x f x a a x R =>∈的值域是区间(]0,1，那么()2f -与()1f 的大小关系是 .14.假设函数)(x f 知足：存在非零常数T ，对概念域内的任意实数x ，有)()(x Tf T x f =+成立，那么称)(x f 为“T 周期函数”，那么有函数① x e x f =)( ②x e x f -=)( ③x x f ln )(= ④x x f =)( ，其中是“T 周期函数”的有 （填上所有符合条件的函数前的序号)三、解答题（本大题共6小题，总分值80分。
广东省湛江市第二十一中学2022-2023学年高一上学期期中数学试题(含答案解析)
广东省湛江市第二十一中学2022-2023学年高一上学期期中数学试题学校:___________姓名：___________班级：___________考号：___________一、单选题1．命题“x ∀∈R ，220x x -≥”的否定是（）A ．x ∀∉R ，220x x -≥B ．x ∀∉R ，220x x -<C ．x ∃∈R ，220x x -≥D ．x ∃∈R ，220x x -<2．已知全集{}1,2,3,4,5U =，集合{}1,3,4A =，集合{}1,5B =，则()U A B = ð（）A ．{}1,4B ．{}1,3C ．{}3,4D ．{}1,3,43．下列函数在定义域内单调递减的是（）A ．12y x =B ．12y x -=C ．1y x -=D ．2y x -=4．已知函数()1,02,0x x f x x x+≤⎧⎪=⎨->⎪⎩，则“02x =-”是“()01f x =-”的（）A ．充分不必要条件B ．必要不充分条件C ．充要条件D ．既不充分也不必要条件5．如图，①②③④对应四个幂函数的图像，其中①对应的幂函数是（）A ．3y x =B ．2y x =C ．y x=D ．58y x =6．函数()2f x x =-的定义域为（）A ．(1，+∞)B ．[1，+∞)C ．[1，2)D ．[1，2)∪(2，+∞)7．已知函数()212my m x n =-+-是幂函数，一次函数()0,0y kx b k b =+>>的图像过点(),m n ，则41kb+的最小值是（）A ．3B ．92C ．143D ．58．若函数2()(2)23f x ax a b x a =++-+是定义在()()22,00,3a a -⋃-上的偶函数，则=a （）A ．2-B ．1-C ．1D ．2二、多选题9．下列函数中既是奇函数，又在()0,∞+上为减函数的是（）A ．()3f x x=B ．()2022f x x =-C ．()f x =D ．()1f x x=10．对于实数a ，b ，c ，下列结论正确的是（）A ．若a b >，则ac bc <B ．若22ac bc >，则a b >C ．若0a b >>，则b aa b+的最小值为2D ．若0c a b >>>，则11c a c b>--11．以下化简结果正确的是（字母均为正数）（）A ．21()x =-B 13y =C ．2132x y-=D ．13x-=12．函数()f x 是定义在R 上的奇函数，下列说法正确的是（）A ．()00f =B ．若()f x 在[0,)+∞上有最小值1-，则()f x 在(,0]-∞上有最大值1C ．若()f x 在[1,)+∞上为增函数，则()f x 在(,1]-∞-上为减函数D ．若0x >时，()22f x x x =-，则0x <时，()22f x x x=--三、填空题13．函数()f x 为R 上的奇函数，且当0x >时，()32f x x =-，则()1f -=___________.14．当1x >时，41x x +-的最小值为______．15．某商场以每件30元的价格购进一种商品，试销中发现，这种商品每天的销量m （件）与售价x （元/件）之间的关系满足一次函数：1623m x =-.若要使每天获得最大的销售利润，则该商品的售价应定为______元/件.16．若函数()f x ，()g x 满足14()22f x f x x x ⎛⎫-=- ⎪⎝⎭，且()()6f x g x x +=+，则(1)(1)f g +-=________．四、解答题17．（1）解关于x 的不等式2560x x -+-≤（结果用集合或区间表示）；（2）化简：312a -⎛ ⎝18．已知集合412P xx ⎧⎫=≥⎨⎬+⎩⎭，非空集合{}11S x m x m =-≤≤+.(1)当2m =时，求P S U ；(2)若S P ⊆，求实数m 的取值范围.19．已知二次函数()f x 为奇函数，且在0x ≥时的图象如图所示.(1)请补全函数()f x 的图象；(2)求函数()f x 的表达式(3)写出函数()f x 的单调区间.20．已知函数21()x f x x+=.(1)判断()f x 奇偶性；(2)当()1,x ∈+∞时，判断()f x 的单调性并证明；21．某工厂的固定成本为4万元，该工厂每生产100台某产品的生产成本为1万元，设生产该产品x （百台），其总成本为g ()x 万元（总成本=固定成本+生产成本），并且销售收入满足()20.5710.5,0713.5,7x x x r x x ⎧-+-<≤=⎨>⎩，假设该产品产销平衡，（利润=收入－成本），根据上述统计数据规律求：(1)求利润f (x )的表达式；(2)工厂生产多少台产品时盈利最大？最大利润是多少？22．已知幂函数()()22317m f x m m x -=--的图像关于y 轴对称．(1)求()f x 的解析式；(2)求函数()()2243g x f x x =-+在[]1,2-上的值域．参考答案：1．D【分析】根据全称量词命题的否定是存在量词命题即得.【详解】因为全称量词命题的否定是存在量词命题，即先将量词“∀”改成量词“∃”，再将结论否定，所以该命题的否定是“x ∃∈R ，220x x -<”.故选：D.2．C【分析】根据交集、补集的定义求解即可.【详解】由题意，得{}2,3,4U B =ð，所以(){}3,4U A B = ð故选：C 3．B【分析】分别讨论选项中函数的单调性，选取符合题意的选项.【详解】由幂函数单调性可知，函数12y x =在定义域[)0,∞+内单调递增，不满足题意；函数12y x -=在定义域()0,∞+内单调递减，满足题意；函数1y x -=在(),0∞-，()0,∞+上均是减函数，但在整个定义域上不是减函数，不满足题意；函数2y x -=为偶函数，在(),0∞-上单调递增，在()0,∞+上单调递减，不满足题意.故选：B 4．A【分析】根据充分条件，必要条件的定义结合分段函数的性质即得.【详解】由()2211f -=-+=-，即“02x =-”⇒“()01f x =-”，由()01f x =-，可知当00x ≤时，可得011x +=-，解得02x =-；当00x >时，可得21x -=-，可得02x =，即“()01f x =-”¿“02x =-”；所以“02x =-”是“()01f x =-”的充分不必要条件.故选：A.5．D【分析】根据函数图象求出幂函数的指数取值范围，得到正确答案.【详解】根据函数图象可得：①对应的幂函数y x α=在[)0,∞+上单调递增，且增长速度越来越慢，故()0,1α∈，故D 选项符合要求.故选：D 6．D【分析】求出使函数式有意义的自变量的范围即可.【详解】由题意1020x x -≥⎧⎨-≠⎩，解得1x ≥且2x ≠．故选：D ．7．B【分析】根据幂函数定义，求出点(),m n ，代入一次函数中，得到2k b +=，再利用基本不等式求41k b+的最小值.【详解】由()212my m x n =-+-是幂函数，可得211m -=，20n -=，即1m =，2n =，又由点()1,2在一次函数y kx b =+的图像上，所以2k b +=，因为0k >，0b >，所以由基本不等式，得()411412k b k b k b ⎛⎫+=++ ⎪⎝⎭145495222b k k b +⎛⎫=++≥= ⎪⎝⎭，当且仅当2k b =时取等号，即当43k =，23b =时，min 4192k b ⎛⎫+= ⎪⎝⎭，故选：B.8．A【分析】根据偶函数的性质可知定义域关于原点对称，由此列出方程，求得答案.【详解】因为偶函数的定义域关于原点对称，则3220a a -+-=，解得2a =-,而当2,1a b =-=时，函数()227f x x =-+是()()6,00,6-⋃上的偶函数，所以2a =-.故选：A.9．BD【分析】根据奇函数和减函数的特性，结合选项判定即可.【详解】选项A ：()3f x x =是奇函数，但在()0,∞+上是增函数，排除A ；选项B ：()2022f x x =-是奇函数，在()0,∞+上为减函数，符合题意；选项C ：()f x =0x ≥，是非奇非偶函数，在()0,∞+上为增函数，排除C ；选项D ：()1f x x=是奇函数，在()0,∞+上为减函数，符合题意；故选：BD 10．BD【分析】根据不等式的基本性质逐一进行判断，要注意不等式性质成立的条件.对A ：考查可乘性，要判断c 的符号；对B ：考查可乘性，显然20c >，故B 正确；对C ：根据基本不等式成立的条件判断；对D ：由已知变换出11c a c b--与的大小.【详解】对A ：若0c ≥时，则不等式不成立，所以A 错；对B ：由22ac bc >，则20c >，两边同乘以21c，所以a b >，故B 正确；对C ：因为0a b >>，所以2b a a b +≥=，当且仅当b a a b =即a b =时取等号，但a b >，故取不到最小值2．故C 不正确；对D ：由0c a b >>>，所以0c a c b <-<-，所以110c a c b>>--，故D 正确；故选：BD.11．BC【分析】根据分数指数幂和根式化简，再结合根号下大于等于零，逐一判断即可得出结论.【详解】对于A，12(0)x x =->，故A 错误；对于B()11236(0)yy y ==>，故B 正确；对于C ，()2231321210,0)y x yx y x-=>>，故C 正确；对于D，131310)x x x-==>，故D 错误.故选：BC【分析】根据奇函数的定义并取特值0x =即可判定A ；利用奇函数的定义和最值得定义可以求得()f x 在(,0]-∞上有最大值，进而判定B ；利用奇函数的单调性性质判定C ；利用奇函数的定义根据0x >时的解析式求得0x <时的解析式，进而判定D ．【详解】由(0)(0)f f =-得(0)0f =，故A 正确；当0x ≥时，()1f x ≥-，且存在00x ≥使得()01f x =-，则0x ≤时，()1f x -≥-，()()1f x f x =--≤，且当0x x =-有()01f x -=,∴()f x 在(,0]-∞上有最大值为1，故B 正确；若()f x 在[1,)+∞上为增函数，而奇函数在对称区间上具有相同的单调性，则()f x 在(,1]-∞-上为增函数，故C 错误；若0x >时，()22f x x x =-，则0x <时，0x ->，22()()()2()2f x f x x x x x ⎡⎤=--=---⨯-=--⎣⎦，故D 正确．故选：ABD ．【点睛】本题考查函数的奇偶性，掌握奇函数的定义是解题关键．13．1【分析】利用奇函数的定义即可求解.【详解】由于函数()f x 为R 上的奇函数，所以()()()21111f f -=-=--=.故答案为：1.14．5【分析】将所求代数式变形为441111x x x x +=-++--，利用基本不等式即可求解.【详解】解：因为1x >，所以10x ->，所以44111511x x x x +=-++≥=--，当且仅当411x x -=-，即3x =时等号成立，所以41x x +-的最小值为5.故答案为：5.【分析】先建立二次函数，再利用配方法求出y 取得最大值时的销售定价x ．【详解】设每天获得的销售利润为y 元，则2(30)(1623)3(42)432y x x x =-⋅-=--+，3054x <<，所以当42x =时，获得的销售利润最大，故该商品的售价应定为42元/件.故答案为：4216．9【解析】根据方程组法求解函数()f x 的解析式，代入求出(1)f ，(1)f -，再利用(1)f -代入求出(1)g -.【详解】由14()22f x f x x x ⎛⎫-=- ⎪⎝⎭，可知()1(242f f x x x x -=-，联立可得()2f x x =，所以(1)2f =，(1)2f -=-又因为(1)(1)165f g -+-=-+=，所以(1)527g -=+=，所以(1)(1)9f g +-=.故答案为：9【点睛】求函数解析式常用方法：（1）待定系数法：若已知函数的类型（如一次函数、二次函数），可用待定系数法；（2）换元法：已知复合函数(())f g x 的解析式，可用换元法，此时要注意新元的取值范围；（3）方程法：已知关于()f x 与1f x ⎛⎫⎪⎝⎭与()f x -的表达式，可根据已知条件再构造出另外一个等式组成方程组，通过解方程组求出()f x ．17．（1）{}23x x x ≤≥或；（2）1a【分析】(1)化简不等式，根据一元二次不等式的解法求其解；(2)根据分数指数幂的定义和指数幂的运算公式求其解.【详解】（1）不等式2560x x -+-≤可化为2560x x -+≥，即()()230x x --≥，因为方程()()230x x --=的解为2x =或3x =，作函数()()23y x x =--的图象如下，观察可得不等式()()230x x --≥的解集为{}23x x x ≤≥或，所以原不等式的解集为{}23x x x ≤≥或；（2）312a -⎛ ⎝()321141322a b b a ---⎛⎫=⋅÷ ⎪⎝⎭312222a b b a ----⎛⎫=÷ ⎪⎝⎭11a a-==18．(1){}23P S x x ⋃=-<≤(2)[]0,1【分析】（1）先求解集合P 中不等式，再结合并集运算求解即可；（2）由集合S 非空求m 的范围，再由S P ⊆，列出不等式组，求解即可.【详解】（1）由412x ≥+，可得202x x -≥+，即()()22020x x x ⎧+-≤⎨+≠⎩，所以{}22P x x =-<≤.又当2m =时，{}13S x x =-≤≤，所以{}23P S x x ⋃=-<≤.（2）因为{}11S x m x m =-≤≤+为非空集合，所以11m m -≤+，所以0m ≥，因为S P ⊆，又{}22P x x =-<≤，所以01212m m m ≥⎧⎪->-⎨⎪+≤⎩，所以01m ≤≤，即所求m 的取值范围是[]0,1.19．(1)图象见解析(2)()()()2211,011,0x x f x x x ⎧--⎪=⎨-++<⎪⎩(3)答案见解析【分析】（1）根据奇函数图象关于原点对称，补全函数()f x 的图象；（2）利用待定系数法，分0,0x x ≥<两种情况求函数的解析式，得到分段函数()f x 的解析式；（3）根据图象及二次函数的对称轴，即可写出()f x 的递增区间及递减区间．【详解】（1）由奇函数的图象关于原点对称，可得函数位于y轴左侧的部分，如图所示：（2）当0x 时，设()()211f x a x =--，又(0)0f =，得1a =，即()()211f x x =--；当0x <时，0x ->，则()()()()221111f x f x x x ⎡⎤=--=----=-++⎣⎦，所以()()()2211,011,0x x f x x x ⎧--⎪=⎨-++<⎪⎩ ；（3）根据函数的图象可知：函数()f x 的单调递增区间是：(-∞，1]-，[1，)∞+；函数()f x 的单调递减区间是：[1-，1]．20．(1)奇函数(2)函数()f x 是()1,+∞上的单调增函数，证明见解析【分析】（1）根据函数解析式得出()()f x f x -=-，即可根据函数奇偶性的定义得出答案；（2）函数()f x 是()1,+∞上的单调增函数，根据函数单调性的定义，任取1x 、()21,x ∈+∞且12x x <，得出()()12f x f x <，即可证明.【详解】（1）函数()f x 的定义域为()(),00,∞-+∞U ，因为22()11()()x x f x f x x x-++-==-=--，所以函数()f x 是奇函数；（2）函数()f x 是()1,+∞上的单调增函数，证：任取1x 、()21,x ∈+∞且12x x <，则()()22221212212112121211x x x x x x x x f x f x x x x x +++---=-=()()()()121212121212121x x x x x x x x x x x x x x -----==，因为211x x >>，所以120x x -<，120x x >，1210x x ->，所以()()120f x f x -<，即()()12f x f x <，所以函数()f x 是()1,+∞上的单调增函数.21．(1)()20.5614.5,079.5,7x x x f x x x ⎧-+-<≤=⎨-+>⎩；(2)工程生产600台产品时盈利最大，最大利润是3.5万元.【分析】（1）利用利润=收入－成本即得；（2）分段求函数的最值即得.【详解】（1）由题可知总成本()4g x x =+，∴利润()()()20.5614.5,079.5,7x x x f x r x g x x x ⎧-+-<≤=-=⎨-+>⎩；（2）当07x <≤时，()()220.5614.50.56 3.5f x x x x =-+-=--+∴当6x =时，()max 3.5f x =，当7x >时，()79.5 2.5f x <-+=，∴工程生产600台产品时盈利最大，最大利润是3.5万元．22．(1)()4f x x =(2)11,2434⎡⎤⎢⎥⎣⎦【分析】(1)根据幂函数的定义和性质求出m 的值即可；(2)由(1)求出函数()g x 的解析式，结合二次函数的性质即可得出结果.【详解】（1）因为()()22317m f x m m x -=--是幂函数，所以23171m m --=，解得6m =或3m =-．又()f x 的图像关于y 轴对称，所以6m =，故()4f x x =．（2）由（1）可知，()()2242222111164316431684g x x x x x x ⎛⎫=-+=-+=-+ ⎪⎝⎭．因为[]1,2x ∈-，所以[]20,4x ∈，又函数21111684y x ⎛⎫=-+ ⎪⎝⎭在1(,)8-∞上单调递减，在1(,)8+∞上单调递增，所以221111116,243844x ⎛⎫⎡⎤-+∈ ⎪⎢⎥⎝⎭⎣⎦．故()g x 在[]1,2-上的值域为11,2434⎡⎤⎢⎥⎣⎦．。
2021-2022学年广东省湛江市吴川一中八年级第一学期期中数学试卷
湛江市2021—2022学年度第一学期期中调研测试八年级数学试卷 说明：考试时间90分钟，满分120分，全卷共25题.一、选择题（本大题10小题，每题3分，共30分）.1.下列长度的三条线段，能组成三角形的是（ ）A.1，3，4B.5，6，12C.5，7，2D.6，8，102.在平面直角坐标系中，点()3,4P 关于y 轴对称点的坐标为（ ）A.()3,4−B.()3,4C.()3,4−−D.()4,3−3.观察下列图形，是轴对称图形的是（ ）A. B. C.D.4.如果等腰三角形的底角为50°，那么它的顶角为（ ）A.80°B.70°C.60°D.50° 5.如图，工人师傅在砌门时，通常用木条BD 固定长方形门框ABCD ，使其不变形，这样做的数学依据是（ ）A.对顶角相等B.两点之间，线段最短 C .三角形具有稳定性 D.垂线段最短6.如图，已知AB AD =，那么添加下列一个条件后，仍无法判定ABC ADC ≌△△的是（ ）A.CB CD =B.BAC DAC ∠=∠C.BCA DCA ∠=∠D.90B D ∠=∠=︒7.如图，ABC △与DEF △关于直线MN 成轴对称，则以下结论中不一定成立的是（ ）A.AB DE =B.B E ∠=∠C.AB DF ∥D.AD 的连线被MN 垂直平分 8.等腰三角形的两边长为3和8，则这个等腰三角形的周长是（ ）A.14B.19C.14或19D.20 9.如图，将三角形纸片ABC 沿DE 折叠，当点A 落在四边形BCDE 的外部时，测量得170∠=︒，2132∠=︒，则A ∠为（ ）A.40°B.22°C.30°D.52°10.如图，在ABC △中，BA BC =，36B ∠=︒，AD 平分BAC ∠，E 为线段AB 的中点，则下列结论：①ACD △是等腰三角形；②DE BA ⊥；③AC BD =；④CD DE =.其中正确的有（ ）A.①③④B.①②C.①②③D.①②③④二、填空题（本大题7小题，每小题4分，共28分）11.七边形的外角和是______.12.如图，250∠=︒，360∠=︒，则1∠的度数为______.13.如图，在ABC △中，90C ∠=︒，AD 是ABC △的角平分线，DE AB ⊥，垂足为E ，若2CD cm =，DE =______cm .14.如图，在Rt ABC △中，90ACB ∠=︒，30A ∠=︒，CD CB =，则ABD ∠的度数为______.15.如图，AC 是正五边形ABCDE 的一条对角线，则BAC ∠的度数为______.16.如图，ABC △中，AB 与AC 的垂直平分线EF 和MN 分别交BC 于E ，N ，垂足分别为F ，M ，若110BAC ∠=︒，则EAN ∠的度数是______.17.如图，一块等腰直角三角板放置在平面直角坐标系内，已知直角顶点H 的坐标为()0,1，另一个顶点G 的坐标为()4,4，则点K 的坐标为______.三、解答题（一）（本大题3小题，每小题6分，共18分）18.如图，已知BD 平分ABC ∠，A C ∠=∠.求证：ABD CBD ≌△△.19.如图，在平面直角坐标系中，点A 的坐标为()2,3−，点B 的坐标为()3,2−，完成下列问题：（1）画出ABC △关于y 轴对称的111A B C △；（2）求ABC △的面积.20.如图，CE AF ⊥于点E ，40F ∠=︒，20C ∠=︒，求FBC ∠的度数.四、解答题（二）（本大题3小题，每小题8分，共24分）21.如图，CAD ∠是ABC △的外角，AE 平分CAD ∠，且AE BC ∥.求证：ABC △是等腰三角形.22.如图，已知ABC △中，AB AC =.（1）尺规作图：作AB 边的垂直平分线DE 交AC 于点D ，交AB 于点E .（2）连接BD ，若40A ∠=︒，求DBC ∠的度数.23.如图，90ADC ∠=︒，DC AB ∥，BA BC =，AE BC ⊥，垂足为点E ，点F 为AC 的中点.（1）求证：CD CE =；（2）连接DE ，试判断DE 与BF 的位置关系，并证明.三、解答题（三）（本大题2小题，每小题10分，共20分）24.如图，ABC △中，AB AC =，45BAC ∠=︒，BD AC ⊥于点D ，AE BC ⊥于点E ，DH AB ⊥于点H ，AE 与BD 相交于点F ，DH 与AE 相交于点G .（1）求AFB ∠的度数；（2）求证：ADF BDC ≌△△；（3）求证：2AF GE =.25.如图，直线AM AN ⊥，AB 平分MAN ∠，过点B 作BC BA ⊥交AN 于点C ，动点E 、D 同时从A 点出发，其中动点E 以2/cm s 的速度沿射线AN 向点C 运动，动点D 以1/cm s 的速度沿射线AM 上运动，当点E 到达点C 时停止运动，已知6AC cm =，设动点D ，E 的运动时间为()s t .（1）求证：AB CB =；（2）若:2:3ABD BEC S S =△△，求t 的值；（3）在点D ，E 运动过程中，是否存在某时刻t ，使得DB BE ⊥？若存在，求出t 的值；若不存在，请说明理由.。
2022-2023学年广东省湛江市第一中学七年级上学期期中数学试题
2022-2023学年广东省湛江市第一中学七年级上学期期中数学试题1.6的相反数是（）A．B ．6C．D．2.表示（）A ．6个相乘的积B．乘以6的积C．个6相乘的积D ．6与相乘的积3.下列各式中结果为负数的是（）A．B．C．D．4.新型冠状病毒肺炎是一种急性感染性肺炎，其病原体是一种先前未在人类中发现的新型冠状病毒，即2019新型冠状病毒，截止到2021年1月13日，全球新冠肺炎确诊病例超8970万例．将8970万用科学记数法可表示为（）A ．8.97×107B ．0.897×108C ．8.97×108D ．89.7×1065.关于单项式的叙述正确的是（）A ．次数是2次B ．次数是1次C ．系数是D ．系数是26.下列说法中错误的是（）A ．任意有理数都可以用数轴上的点来表示B ．一个数的绝对值越大，表示它的点在数轴上离原点越远C ．0既不是正数，也不是负数D．若，则7.下列各式中，合并同类项正确的是（）A．B ．C ．D ．8.一实验室检测A 、B 、C 、D 四个零件的质量（单位∶克），超过标准质量的克数记为正数，不足标准质量的克数记为负数，结果如图所示，其中最接近标准质量的零件是（）A．B．C．D ．9.下列各式一定成立的是（）.A．B ．C．D ．10.如图，A、B两点在数轴上表示的数分别为a、b，下列式子成立的是（）A．ab＞0B．a+b＜0C．（b﹣1）（a+1）＞0D．（b﹣1）（a ﹣1）＞011.如果向北走20米记作+20米，那么向南走120米记为______米.12.比较大小：__________（填“”、“”或“”）．13.若a与互为相反数，则a的值__________．14.绝对值小于3的整数有_______个．15.已知代数式的值为7，则的值为____________．16.如果多项式中不含的项，则k的值为______17.如果x、y都是不为0的有理数，则代数式的值为_______．18.计算题．(1)；(2)．19.化简：．20.把下列各数在数轴上表示出来，并按从小到大的顺序用“”连接起来．，，，，5．21.已知a、b互为相反数，且，c、d互为倒数，求的值．22.某冰箱销售商今年四月份销售冰箱（a-1）台，五月份销售冰箱比四月份的2倍少1台，六月份销售冰箱比前两个月的总和还多5台．（1）五月份和六月份分别销售冰箱多少台？（2）六月份比五月份多销售冰箱多少台？23.设，．(1)化简；(2)若，求的值．24.小明家买了新房子，建筑平面图如图所示两卧室是形状及大小完全相同的长方形，（单位：米）．（1）用含x、y的式子表示这套住宅的总面积：（2）现将两间卧室铺设地板，其他房间全部铺设瓷砖，若每平方米地板的价格为120元，每平方米瓷砖的价格为90元．用含x、y的式子表示铺设地面的总费用：（3）求当，时，铺设地面的总费用．25.在数轴上，我们可以利用线段端点表示的两个数进行减法运算的方法，即大的数减去小的数，求线段的长度．如图，在数轴上，点A、B、C表示的数分别是、0、3．线段；线段；线段．(1)若点E、F表示的数分别是和2，则线段的长为．(2)点M、N为数轴上的两个动点，点N在点M的左边，点M表示的数是，若线段的长为12，则点N表示的数是．(3)点P、Q为数轴上的两个动点，动点P从点A出发，以每秒2个单位长度的速度沿运动．动点Q从点C出发，以每秒1个单位长度的速度沿数轴向终点A运动．设点P、Q的运动时间为秒．①当点P沿运动时，求点P、Q相遇时t的值．②当点B将线段分成的两部分的比为时，直接写出t的值．。
广东省湛江市第二十一中学2023-2024学年高一上学期期中考试英语试题
广东省湛江市第二十一中学2023-2024学年高一上学期期中考试英语试题学校:___________姓名：___________班级：___________考号：___________一、阅读理解Events at London Canal MuseumThere is plenty going on at London Canal Museum. We have regular monthly illustrated talks in the evening. We have summer boat trips through the long Islington Tunnel on certain dates. We have occasional special days of activities for families or adults. We also occasionally offer roses and castles painting courses, and other events.28th MaySummer Tunnel Trips from the museum through Islington Tunnel and back. Booking is online — click this link. A guide will travel on the boat and will explain the history as you cruise through the lengthy Tunnel.31st MayWatery Wednesday an activity day for children, put on by our education team. Take a short boat trip! Suitable for ages 6-12 approximately. The theme is birds and butterflies, nature and the canal.1st JuneIllustrated talk: Saving the Lichfield and Hatherton Canals by David Dixon. An epic story of the major tasks involved. ￡8.90 adult, ￡6.50 child including museum admission.Until 24th SeptemberExhibition:Brindley 300 A large exhibition produced by the National Waterways Museum now showing in London for the first time. James Brindley was born 301 years ago, he was a pioneer of canals and, together with the “Canal Duke”, of Bridgwater, he started the development of modern transport. His contribution to making this country a great industrial nation was great, and this exhibition celebrates his life and achievements.The events arrangement can easily be included into any other website and will automatically be updated. See Other Webmasters page for details.1．What a child will choose if he is interested in birds?.A．Summer Tunnel Trips B．Watery WednesdayC．Illustrated talk D．Brindley 3002．How much will you pay if your family(a couple and a kid) attend David Dixon’s talk?A．￡24.30B．￡15.40C．￡17.80D．￡13.003．Where can you probably find this text?A．In a poster.B．In a travel book.C．In an art magazine.D．On the Internet.What a day! I started at my new school this morning and had the best time. I made lots of new friends and really liked my teachers. I was nervous (紧张的) the night before, but I had no reason to be. Everyone was so friendly and polite. They made me feel at ease. It was like I’d been at the school for a hundred years!The day started very early at 7:00 a.m. I had my breakfast downstairs with my mom. She could tell that I was very nervous. Mom kept asking me what was wrong. She told me I had nothing to worry about and that everyone was going to love me. If they didn’t love me, mom said to send them her way for a good talking to. I couldn’t stop laughing.My mom dropped me off at the school gate about five minutes before the bell. A little blonde (金黄色的) girl got dropped off at the same time and started waving (招手) at me. She ran over and told me her name was Abigail. She was very nice and we became close straight away. We spent all morning together and began to talk to another girl called Stacey. The three of us sat together in class all day and we even made our way home together! It went so quickly. Our teacher told us that tomorrow we would really start learning and developing new skills.I cannot wait until tomorrow and feel as though I am really going to enjoy my time at my new school. I only hope that my mew friends feel the same way too.4．How did the author feel the night before her new school?A．Tired.B．Excited.C．Worried.D．Relaxed. 5．What happened on the author’s first day of school?A．She met many nice people.B．She had a hurried breakfast.C．She learned some new skills D．She arrived at school very early. 6．How did the author go to school according to the passage?A．On foot.B．By bus.C．In her mother’s car.D．By train.7．What can we infer (推断) about Abigail?A．She disliked Stacey.B．She was shy and quiet.C．She got on well with the author.D．She was an old friend of the author.My two daughters and I got into the car to spend our weekend in Florida. Autumn, the elder one, offered to drive. I sat next to her, and Amber sat in back. After setting out, the three of us sang to the radio at the top of our voice.It was a great trip until the rain poured and the rain was too heavy. “I have to pull over.” Autumn said. She tried to enter the far right lane (车道) to find a place to stop, but trucks ran fast, making water onto our car. The car was out of control, then worse — it started to move left and right. Autumn fought to control it but it was too late. We ran into a truck. The girls jumped out of the car. My chest felt much pain.“Get out, Mom. Come on!” Amber cried. “I can’t.” I said. Autumn took out her cellphone. “There’s been an accident. Send an ambulance (救护车)!” Amber and Autumn pulled me out of the car and helped me lie on my back in the grassy area by the roadside. I had to calm myself and looked up. A man held a large umbrella over me and other kind faces appeared above me. A woman helped to treat a cut over Amber’s eye. Another woman came close to me and said, “No one in the truck was injured. Help was on the way.” The woman mentioned she was a nurse; the other woman who took care of Amber’s cut was an eye specialist. We couldn’t have asked for better care.In the hospital the pain in my chest began to disappear. Later, the tests at the hospital made sure we had no serious injuries. We’d left all our troubles behind thanks to these kind people, who seemed to be angels (天使) in my eyes.8．How did the author and her two daughters feel after setting out?A．They were worried about the weather.B．They enjoyed themselves greatly.C．They thought it was a long journey.D．They felt lucky to take the journey. 9．What’s Autumn going to do when the rain poured?A．To stop by the roadside.B．To follow the truck closely,C．To get into the fast traffic lane.D．To move the car left and right. 10．Which is TRUE according to the accident?A．The author herself drove the car.B．It was raining heavily.C．A nurse held a large umbrella to help.D．The truck driver was badly injured.11．What can be the best title for the text?A．Unexpected heavy rain B．Leave our troubles behindC．Kind angels saved the day D．My two kind daughtersexpected. Representing (代表) the United Kingdom, she won the U.S. Open title. She beat 19-year-old Canadian Leylah Fernandez for the win with a final score of 6-4, 6-3 in the final.Raducanu’s performance at the U.S. Open had already made history even before her win: she competed as a qualifier (资格赛球员), and was the first qualifier in either men’s or women’s tennis to even make it to the finals of a Grand Slam tournament (锦标大赛).Raducanu was born in Toronto, Canada but moved to London when she was 2 years old. She’s been playing tennis since she was 5. Her father is Romanian and her mother is Chinese; they both work in finance. “They both come from very hard-working countries. I followed their example to work hard too,” Raducanu said.During the 2018 Wimbledon junior competition, Raducanu made it to the girls’ quarterfinals. She began her professional career (职业生涯) in 2018 and competed in her first Grand Slam event in June 2021 with Wimbledon. She finally had to pull out during the fourth round because of breathing (呼吸) problems, but even so, by reaching the third round, she became the youngest British woman to make it that far since 2002. Before that, she’d taken more than a year off because of COVID-19 and to finish high school.Raducanu’s becoming a star has been nothing short of amazing: She’s the youngest player to win a Grand Slam singles tournament since 2004, unseating Maria Sharapova, who won Wimbledon in 2004 at only 17 years old. She’s also the first woman player to take home a title in her second appearance at a Grand Slam.With her U.S. Open win, she’s become a rising star of the tennis world. And she’s also achieved a lifelong dream, she said.“It’s a dream,” she said. “I’ve always dreamed of winning a Grand Slam. You just say these things. You say, ‘I want to win a Grand Slam.’ I actually put in a lot of work, and winning a Grand Slam, I can’t believe it.”12．What does the underlined word “feat” in paragraph 1 mean?A．Training.B．Research.C．Achievement.D．Education. 13．What did Raducanu think of her parents?A．They’re quite different.B．They’re her role models.C．They live a very hard life.D．They force her to work hard. 14．What happened to Raducanu at 2021 Wimbledon?A．She broke the rules.B．She had some health problems.C．She failed to enter the third round.D．She received unfair treatment at the finals.15．What did Raducanu say about winning a Grand Slam?A．It was a very difficult task.B．It depended on some luck.C．It was her lifelong dream.D．It happened as she expected.二、七选五Life is a mix of good and bad days. Each new day presents us with a fresh opportunity to learn new lessons. Sometimes, you learn these new lessons in your daily lives. On other days,Here are some of the life lessons you can learn from playing poker.Life is not fair.Life is not designed to be fair. Some people will get the best cards while others will have to deal with the waste pieces. Life has its rules, but sticking to them does not exactly mean you will achieve success. 17 What you can do in life and in a game of poker is directly influence the things under your control.Protect yourself.You are the most important person in your life. When playing poker, you are the most important player, and the cards you have are valuable things. 18 Always be sure to be in charge of your safety.Learn from mistakes.19 You learn from mistakes, and rather than trying to avoid mistakes, you should instead try to avoid repeating the same mistake. If you are trying to avoid mistakes in a poker game, you can get left behind quickly.20Gains and losses are a part of life. You win some to lose some, just like in a game of poker. Some risky actions may prove unprofitable after you are neck-deep in them. In such cases, you must know when to quit, count your losses, and bounce back better.A．Mistakes are a part of life.B．Know when to cut your losses.C．Catch chances to improve yourselves.D．The game of poker shows life in so many ways.E．You have to trust yourself by not taking unbearable risks.F．You are considered foolish when making the same mistakes.G．Following the rules in poker does not mean you will win, either.三、完形填空he suddenly saw a man with his right leg spotted with the blood ran into the stadium. This man ran lamely(跛脚地) out of breath, but he didn’t stop. After he ran along the track for aalso a success.21．A．gradually B．officially C．actually D．extremely 22．A．morning B．darkness C．flash D．view 23．A．admiring B．exploring C．designing D．celebrating 24．A．busy B．crowded C．empty D．noisy 25．A．before B．when C．while D．once 26．A．mile B．minute C．circle D．second 27．A．lay on B．relied on C．made up D．signed up 28．A．sight B．curiosity C．control D．order 29．A．goal B．campus C．site D．track 30．A．proud B．excited C．mad D．gentle 31．A．complete B．improve C．appreciate D．challenge 32．A．Therefore B．Though C．Otherwise D．Besides 33．A．attract B．annoy C．cheer D．recognize 34．A．frightening B．exciting C．touching D．confusing 35．A．achievements B．changes C．progress D．efforts四、用单词的适当形式完成短文what I really love most,”she says.五、用单词的适当形式完成句子适当形式填空)47．There are special (arrange) for people working for that organization . （所给词的适当形式填空）48．It is confusing that these chairs are light but (extreme) strong. (所给词的适当形式填空)49．He is eager to spend all his time (explore) further into the scientific world. (所给词的适当形式填空)50．The fact is that each of us has our own (strong) and weakness. (所给词的适当形式填空)51．Seeing me，the confident girl gave me a (determination) look. (用所给词的适当形式填空)52．The art show was far from being a (fail); it was a great success. （所给词的适当形式填空）53．We all have a (responsible) to protect the environment. (所给词的适当形式填空)54．Communicating with foreigners (fluent) needs much practice. (所给词的适当形式填空)55．We had lots of fun at Mary’s party last Sunday and it was an (impress) memory. （用单词适当形式填空）56．(obvious), the new school is badly in need of good teachers. (所给词的适当形式填空)六、选用适当的单词或短语补全句子七、建议信64．假如你是李华，你的朋友John刚转学到了一个新学校，感到很孤单，于是向你寻求帮助。
广东省湛江一中上学期高三期中考试语文试卷(Word版,含答案)
广东省湛江一中高三年级第一学期期中考试语文科试卷考试时间：150分钟满分150分命题教师：高三备课组注意事项：1．本试题分为选择题和非选择题，共8页。
2．答卷前，请务必先将自己的班级、姓名、座位号、分别填写在答题卡及作文纸的相应位置上。
一、本大题4小题，每小题3分，共12分。
1．下列词语中加点的字，每对读音都不相同的一组是（）A．机杼．/枢．纽扉．页/蜚．声黑白相间．/间．不容发B．奢侈．/豆豉．旧箧．/面颊．脉脉．．含情/脉．络分明C．鞭笞．/苔．藓垣．墙/盘桓．押解．赴京/解．甲归田D．联袂．/昧．心蹒跚．/姗姗．．低声呜咽．/吞咽．口水2．下列各句中，加点的词语使用恰当的一句是A．广交会为企业提供了内外贸对接的契机，但这种对接不可能一挥而就．．．．，绝大多数出口企业由于不熟悉国内市场，即使有意内销也无从着手。
B．2月28日，中国外长杨洁篪在会见日本外相时就钓鱼岛主权问题全面阐述了中方的严正立场，要求日方谨言慎行．．．．，避免事态扩大化。
C．台独分子不断散布台独言论，干着分裂祖国的勾当，这些危言危行．．．．总有一关会成为套在他们脖子上的绞索。
D．个别领导干部利用职务之便，玩忽职守，以权谋私，这无异于火中取栗．．．．，不但烫手，且玩火者必自焚。
3．下列句子中，没有语病．．．．的一项是A．孟非是近年来深受观众喜爱的电视主持人，常常妙语连珠，亲和力很强，拥有广泛的支持者，有很高的收视率。
B．去年4月以来，国务院出台了一系列楼市调控政策，一路高歌猛进的国内楼巿因此有了微妙的变化，人们对未来楼巿走向也有着更多的疑惑与期待。
C．若一个人对社会做出贡献，社会能够给其应有的回报，他就会对社会产生责任感。
近年来，中国政府将明确提出这一基本理念，并在政策制定、执行上有所体现。
D．在冬季，日照时间不但减少，而且人体骨骼密度最低，骨折患者尤其是老年骨折患者人数明显增多，医院多个科室不得不加床收治病人。
4．依次填入下面一段文字横线处的语句，衔接最恰当的一组是：两种不同的伦理思想形成中西文化思想两种不同的类型，中国人侧重个人本位，________，________，________。
广东省湛江市第一中学2024-2025学年上学期第一次教学质量检测九年级数学试题
广东省湛江市第一中学2024-2025学年上学期第一次教学质量检测九年级数学试题一、单选题1．下列著名曲线中，既是轴对称图形也是中心对称图形的是（）A ．B ．C ．D ．2．如图，在⊙O 中，∠BOC ＝130°，点A 在 BAC 上，则∠BAC 的度数为（）A ．55°B ．65°C ．75°D ．130°3．已知抛物线2y x mx =+的对称轴为直线2x =，则m 的值是（）A ．4B ．2C ．2-D ．4-4．两年前生产1千克甲种药品的成本为80元，随着生产技术的进步，现在生产1千克甲种药品的成本为60元．设甲种药品成本的年平均下降率为x ，根据题意，下列方程正确的是（）A ．()280160x -=B ．()280160x -=C ．()80160x -=D ．()801260x -=5．如图，BD 是O 的直径，A ，C 在圆上，50A ∠=︒，DBC ∠的度数是（）A ．50°B ．45°C ．40°D ．35°6．若关于x 的一元二次方程()22240a x x a +++-=的一个根是0x =，则a 的值为（）A ．2B ．2-C ．2或2-D ．127．关于二次函数()215y x =-+，下列说法正确的是（）A ．函数图象的开口向下B ．函数图象的顶点坐标是()1,5-C ．该函数有最大值，最大值是5D ．当1x >时，y 随x 的增大而增大8．小影与小冬一起写作业，在解一道一元二次方程时，小影在化简过程中写错了常数项，因而得到方程的两个根是6和1；小冬在化简过程中写错了一次项的系数，因而得到方程的两个根是−2和5-．则原来的方程是()A ．2650x x ++=B ．27100x x -+=C ．2520x x -+=D ．26100x x --=9．如图，AB 是O 的直径，OD 垂直于弦AC 于点D ，DO 的延长线交O 于点E ．若AC =4DE =，则BC 的长是（）A ．1BC ．2D ．410．如图，ABC V 中，90ACB ∠=︒，将ABC V 绕点C 顺时针旋转得到EDC △，使点B 的对应点D 恰好落在AB 边上，AC 、ED 交于点F ．若BCD α∠=，则EFC ∠的度数是（用含α的代数式表示）（）A ．1902α︒+B ．1902α︒-C ．31802α︒-D ．32α二、填空题11．已知点()2,A b -与点(),3B a 关于原点对称，则a b ÷=．12．一圆形玻璃镜面损坏了一部分，为得到同样大小的镜面，工人师傅用直角尺作如图所示的测量，测得12cm AB =，5cm BC =，则圆形镜面的直径为cm ．13．如图，∠DCE 是⊙O 内接四边形ABCD 的一个外角，若∠DCE ＝72°，那么∠BOD 的度数为．14．如图，以40m/s 的速度将小球沿与地面成30︒角的方向击出时，小球的飞行路线将是一条抛物线．如果不考虑空气的阻力，小球的飞行高度h （单位：m ）与飞行时间t （单位：s ）之间具有函数关系2205h t t =-，则小球从飞出到落地要用s15．已知实数a 、b 满足a －b 2＝4，则代数式a 2－3b 2＋a －14的最小值是．三、解答题16．解方程：2230x x --=．17．数学活动课上，张老师组织同学们设计多姿多彩的几何图形，下图都是由边长为1的小等边三角形构成的网格，每个网格图中有3个小等边三角形已涂上阴影，请同学们在余下的空白小等边三角形中选取一个涂上阴影，使得4个阴影小等边三角形组成一个轴对称图形或中心对称图形，请画出4种不同的设计图形．规定：凡通过旋转能重合的图形视为同一种图形）18．已知关于x 的一元二次方程()2210x m x m -++-=．(1)求证：无论m 取何值，方程都有两个不相等的实数根；(2)如果方程的两个实数根为1x ，2x ，且121239x x x x +-=，求m 的值．19．如图，已知二次函数2y x bx c =-++的图像与x 轴交于(2,0)A -，(1,0)B 两点．(1)求b c 、的值；(2)若点P 在该二次函数的图像上，且PAB 的面积为6，求点P 的坐标．20．为了落实劳动教育，某学校邀请农科院专家指导学生进行小番茄的种植，经过试验，其平均单株产量y 千克与每平方米种植的株数x （28x ≤≤，且x 为整数）构成一种函数关系．每平方米种植2株时，平均单株产量为4千克；以同样的栽培条件，每平方米种植的株数每增加1株，单株产量减少0.5千克．(1)求y 关于x 的函数表达式．(2)每平方米种植多少株时，能获得最大的产量？最大产量为多少千克？21．如图，四边形ABCD 内接于O ，AC 为O 的直径，ADB CDB ∠=∠．(1)试判断ABC V 的形状，并给出证明；(2)若AB =1AD =，求CD 的长度．22．综合与实践问题情境：在Rt ABC △中，90BAC ∠=︒，6AB =，30C ∠=︒，直角三角板EDF 中90EDF ∠=︒，将三角板的直角顶点D 放在Rt ABC △斜边BC 的中点处，并将三角板绕点D 旋转，三角板的两边DE ，DF 分别与边AB ，AC 交于点M ，N ．猜想证明：(1)如图①，在三角板旋转过程中，当点M 为边AB 的中点时，试判断四边形AMDN 的形状，并说明理由；问题解决：(2)在三角板旋转过程中，当B MDB ∠=∠时，求线段AN 的长；(3)在三角板旋转过程中，当AM AN =时，直接写出线段AN 的长．23．综合与实践问题情境：如图①，矩形MNKL 是学校花园的示意图，其中一个花坛的轮廓可近似看成由抛物线的一部分与线段AB 组成的封闭图形，点A ，B 在矩形的边MN 上．现要对该花坛内种植区域进行划分，以种植不同花卉，学校面向全体同学征集设计方案．方案设计：如图②，6AB =米，AB 的垂直平分线与抛物线交于点P ，与AB 交于点O ，点P 是抛物线的顶点，且9PO =米．欣欣设计的方案如下：第一步：在线段OP 上确定点C ，使90ACB ∠=︒，用篱笆沿线段AC BC ，分隔出ABC V 区域，种植串串红；第二步：在线段CP 上取点F （不与C ，P 重合），过点F 作AB 的平行线，交抛物线于点D ，E ．用篱笆沿DE CF ，将线段AC BC ，与抛物线围成的区域分隔成三部分，分别种植不同花色的月季．方案实施：学校采用了欣欣的方案，在完成第一步ABC V 区域的分隔后，发现仅剩6米篱笆材料．若要在第二步分隔中恰好用完6米材料，需确定DE 与CF 的长．为此，欣欣在图②中以AB 所在直线为x 轴，OP 所在直线为y 轴建立平面直角坐标系．请按照她的方法解决问题：(1)在图②中画出坐标系，并求抛物线的函数表达式；(2)求6米材料恰好用完时DE 与CF 的长；(3)种植区域分隔完成后，欣欣又想用灯带对该花坛进行装饰，计划将灯带围成一个矩形．她尝试借助图②设计矩形四个顶点的位置，其中两个顶点在抛物线上，另外两个顶点分别在线段AC BC ，上．直接写出符合设计要求的矩形周长的最大值．。
广东省湛江市第二十一中学2022-2023学年高一上学期期中考试英语试题
广东省湛江市第二十一中学2022-2023学年高一上学期期中考试英语试题学校:___________姓名：___________班级：___________考号：___________一、阅读理解Dance ClassesBalletBallet teaches grace, posture (姿势) and flexibility. Students focus on the use of proper ballet items (物品), expanding their knowledge of classical ballet techniques and improving motor skills for classical ballet practice. The class is a formal ballet class.Age: 8—10Date: September 7, 2019—May 16, 2020Time: 10:30 am—12:00 am on SaturdaysCreative MoversStudents can explore creative movement, balance, focus, the development of skills, motor planning and balance. The class helps build strength, flexibility and self-confidence, and allows children to realize expression in a positive and encouraging environment. Children use their imagination to celebrate movement and have lots of fun.Age: 3—5Date: September 7, 2019—January 18, 2020Time: 9:00 am—9:45 am on SaturdaysJazzJazz includes movements from both classical ballet and dance techniques. This class will focus on traditional Jazz dance. Students will be introduced to jazz-style rhythms and movements. In order to ensure proper placement for your child, we invite all students to participate in a sample (示例) class. Students and parents work with program staff to meet students’ personal dance goals.Age: 5—6Date: September 7, 2019—May 16, 2020Time: 2:00 pm—3:00 pm on SaturdaysHip HopStudents will be introduced to several different aspects of hip hop dance includingPopping, Locking, Breaking and Tutting in a high-energy environment. Our hip hop instructors are highly knowledgeable and will provide students with a wonderful view of hip hop dance.Age: 7—10Date: September 7, 2019—May 16, 2020Time: 1:00 pm—2:00 pm on Sundays1．Which class is suitable for 4-year-old children?A．Ballet.B．Creative Movers.C．Hip Hop.D．Jazz. 2．What can students do in the jazz class?A．Make use of all the ballet items.B．Learn the long history of jazz.C．Dance with famous modern jazz dancers.D．Get to know jazz-style movements.3．What is special about the hip hop class?A．It is open in the afternoon.B．It is available on Sunday.C．It teaches traditional dances.D．It has the most skilled teachers.You may not know a lot of people when you start senior high school. Maybe your friends from junior high school are going to a different senior high school. Even if you know other freshmen (一年级学生), you still feel jittery that you don’t know any upperclassmen. How are you going to make friends among this sea of unknown faces?Most senior high schools hold the freshman orientation (迎新会) before school actually starts. It is helpful because you not only learn your way around the building but also get to meet some of your teachers and fellow freshmen. That way, when you show up on your first day of school, you may already recognize a few familiar faces.When you talk to people at orientation, you’ll probably find that a lot of them are feeling just like you are. They’re all new to the school and don’t know what to expect. Talking about a common concern with your classmates can help you develop friendships.The work in senior high school is something freshmen are probably worried about. It builds on what you learned in junior high school, giving you a more advanced (高深的) knowledge of many subjects. So you may find you have more work to do or that it’s a bit more challenging. If you ever find your work too difficult, teachers can give you extra help.Senior high school also has more after-school activities than junior high school, such as clubs, music and theater groups and sports teams. This is a good time to explore your interests and try new things.Junior high school taught you the basics of time management and social skills while providing you with a little extra support and guidance. Senior high school gives you the chance to learn how to be more independent and responsible.4．What does the underlined word “jittery” mean in Paragraph 1?A．Proud.B．Confident.C．Anxious.D．Bored. 5．What are freshmen probably worried about?A．The learning task.B．The freshman orientation.C．The ability to make friends.D．The relationship with teachers.6．What do after-school activities mainly help students to do?A．Develop friendships.B．Develop their interests.C．Build up their strength.D．Improve their learning ability.7．What is the last paragraph mainly about?A．What you learned in junior high school.B．The importance of being more independent.C．How to improve yourself in senior high school.D．The difference between junior high school and senior high school.Travel is fun and exciting, but it's not if you get sick．You may think,“Not me, I won't get sick on my vacation．”But for many people, that is what happens．A vacation is supposed to be a time for relaxing．But very often it is not．“What can I do when I am a tourist?”This is what we should often think about．Usually there are so many places to visit：museums, shops, parks and churches．You may spend most days walking around these places．This can be very tiring．Your feet may hurt．And you may have a terrible headache after a few hours．If this is what you feel, you should take a rest．Don't ask your body to do too much．A tired body means a weak body．And a weak body can make you get sick easily．Just sit down for a few hours in a nice spot．In good weather, look for a quiet park bench．Or you can rest at a café．You can learn a lot by watching people when you have a rest．Sleep is also important．If you want to stay healthy you need enough sleep．You may have trouble sleeping at night when you travel．Your hotel room may be noisy, or the bed maybe uncomfortable．If that is true, don't be afraid to change rooms or hotels．You may not get enough sleep for another reason．You may want to stay out late at night．In many cities the night life can be very exciting．Then you should plan to sleep for an hour during the day．That extra hour can make a big difference．Finally, if you want to stay healthy, you must eat well．That means eating the right kinds of foods．Your body needs fresh fruit and vegetables, and some meat, milk or cheese．When you are in a new country you may want to try new foods but you need to be careful about how much you eat．Lots of rich food is not very good for you．8．Travel is____________.A．the best way to relax B．unhealthyC．never any fun D．very tiring9．It's a good idea to ________ when travelling．A．spend every night in hotels.B．change hotels.C．get some rest every day.D．take lots of medicine. 10．According to the passage, we can get to know the local people by ________．A．watching them B．visiting their homesC．writing to them D．going to the shops11．Which of the following is true to stay in good health on a vacation?________A．Try not to visit every museum and church in a place．B．Eat proper food, have enough sleep and rest．C．Stay up late every night and sleep for an hour in the day．D．Visit as many shops as you can．When Tony took up running as a hobby, he was 42 years old. Now 42 years later he’s a national champion and a world record holder.He never imagined at the age of 84 this is where he’d be, but then he doesn’t meet many people in their 80s who are out training four times a week.“I can see it’s a bit unusual, yes. But it’s been my life, ” he told the reporter.The retired officer runs at a track near his home in Leeds.At an event in Italy last month he set a world record in the 80 metres hurdles (跨栏) with a time of under 17 seconds. But he sees no reason to slow down and his ambition is still to be competing when he passes a hundred.“I probably won’t be doing a crouch start (蹲式起跑), but it’s only 16 years away,” he joked. Like anyone his age, he’s had health problems. He’s had a string of severe heart attacks, but doctors have told him as long as it makes him feel good, he should carry on running.“I can’t let my heart get in the way of my training. When I am sprinting, I have to give it my absolute all. My heart is the last thing on my mind.” he said.He trains every other day, dances and plays hockey and he recently cuts down on alcohol and chocolate. He said, “I’ve heard alcohol can lead to dementia and I don’t want that. I’ve cut down to one glass of wine every other day. I now have to stay as fit as I can be to keep up my lifestyle.”Tony’s next birthday is next September. And the first thing he wants to do is to become the world’s fastest 85-year-old.12．What will Tony do after the competition in the Italy ?A．He decides to slow down.B．He decides to retire as an officer.C．He plans on running until he’s 100.D．He plans to compete in the 100 metres hurdles.13．What do the doctors suggest to Tony?A．Trying to run as fast as he can.B．Continuing to run if he feels good.C．Cutting down on alcohol and chocolate.D．Stopping running to treat his heart disease.14．Which of the following best describes Tony?A．Imaginative.B．Positive.C．Caring.D．Self-centered 15．What’s the best title of the text?A．A National Champion.B．The Fastest Man in the World.C．The World’s Fastest 85-year-old.D．Granddad Crowned Fastest 84-year-old in the World.二、七选五When you step into a new environment，you must have a strong wish to fit in．Fitting inmeans making more friends，having more influence on others and getting more chances to live a happier life．____16____Be confident．Confidence attracts most people．Everyone is special and there is only one person like you in this world．Spend some time thinking about your strongpoints．____17____ You won’t have much difficulty fitting in．Be kind to everyone．Kindness is the bridge to your own happiness．When people notice your kindness，they will return it one day．Always give more than you receive，and think more of others than of yourself．____18________19____ Various activities like playing football can help you to be known to others．You may add more friends to your circle．At the same time，you’ll be amazed to see how much they like you．Instead of wasting time being alone，go out to dance and sing together with others to develop friendship．Do smile to everyone every day．It makes both you and others feel happy．____20____ Humor catches others’ attention as well．People will like you because you make them live happily．If you follow the suggestions mentioned above，you will be accepted by people around you．As a result，you will fit in very well and enjoy your new life．A．Be active in group activities．B．However，everybody needs friends．C．Here are some suggestions that can help you．D．A pleasant smile costs the least and does the most．E．A person who cares about others is popular everywhere．F．Even so，it often leaves one to wonder if we fit in well．G．If so，you will be able to build up confidence step by step．三、完形填空A long time ago, there lived a girl called Lily. When she started going to school, she was____21____. All her classmates bullied(霸凌) her for her shy behaviour. If the teacher asked any questions she would not answer because of her shyness. But she wasa____22____student and she knew all the answers.Out of all the subjects, her favorite subject was sports.She always____23____to be afootball player on her school team. But the students always made fun of her. ____24____, she did not care what her____25____would say as she wanted to tell them that she could be a football player.So during the day, Lily____26____her school, and at night she would practice football at her home. Her mother installed(安装)some more lights in their garden so that her daughter could____27____properly.After practicing for long, finally, the selections for the inter-school for football competition came. Lily, without a thought____28____to go for it. Herclassmates____29____her, and said, “Boo! You will not make it. Back off!”But Lily decided not to____30____their words.As she began to play, everybody was____31____her excellent skills.The judges(裁判)were so amazed by her confident____32____that they not only selected Lily but also made her the team leader. Now, everybody wanted to become Lily’s friend and soon she became the____33____girl in the school. Lily’s story is one of the____34____stories for kids that help them to do their work with the right____35____.21．A．friendly B．bored C．shy D．patient 22．A．young B．bad C．new D．bright 23．A．wanted B．walked C．needed D．agreed 24．A．Therefore B．However C．As D．Because 25．A．classmates B．parents C．teachers D．teammates 26．A．visited B．attended C．closed D．supported 27．A．research B．rest C．study D．practice 28．A．decided B．learned C．refused D．forgot 29．A．focused on B．applied for C．laughed at D．cared about 30．A．introduce B．consider C．say D．copy 31．A．thankful for B．satisfied with C．proud of D．surprised by 32．A．voice B．behaviour C．smile D．sex 33．A．most interesting B．most exciting C．most popularD．most beautiful34．A．famous B．dangerous C．encouraging D．confusing 35．A．team B．community C．group D．attitude四、用单词的适当形式完成短文阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
2023-2024学年广东省湛江一中高一(上)期中数学试卷【答案版】
2023-2024学年广东省湛江一中高一（上）期中数学试卷一、单项选择题（本题共8小题，每小题5分，共40分，在每小题给出的四个选项中，只有一项是符合题目要求的。
）1．已知幂函数y ＝f （x ）的图象过点(2，√2)，则f （9）＝（ ） A ．3B ．13C ．9D ．192．已知集合A ＝{y |y ＝x ，x ＞0}，B ＝{x ∈N ||2x ﹣3|≤1}，则A ∩B ＝（ ） A ．{0，1，2} B ．{1，2}C ．{1，2，3}D ．{2，3}3．设函数f(x)={f(x −1)，x ≥0，x 3−1，x ＜0，，则f （f （4））＝（ ）A ．﹣2B ．﹣9C ．﹣10D ．﹣114．已知函数f(x)={−x 2+2ax −1，x ＜2log a (x −1)+2a ，x ≥2，则“a ≥2”是“f （x ）在R 上单调递增”的（ ）A ．充要条件B ．充分不必要条件C ．必要不充分条件D ．既不充分又不必要条件5．已知f （x ）＝2ax ﹣1+3a ，f （0）＜f （1）且在（1，2）内存在零点，则实数a 的取值范围是（ ） A ．(15，13)B ．(16，14)C ．(17，15) D ．(18，16)6．已知正实数a ，b 满足2a +b ＝6，则2a+1b+2的最小值为（ ） A ．45B ．43C ．98D ．947．已知a ，b ，c 均大于1，满足1a−1=log 2a ，1b−1=log 3b ，1c−1=log 4c ，则下列不等式成立的是（ ）A ．c ＜b ＜aB ．a ＜b ＜cC ．a ＜c ＜bD ．c ＜a ＜b8．设f （x ）＝|1﹣2x |，若关于x 的方程f 2（x ）﹣3tf （x ）+2t 2＝0有三个不同的实数根，则实数t 的取值范围为（ ） A ．（0，1）B ．(0，12)C ．[12，1)D ．（0，1]二、多项选择题（本题共4小题，每小题5分，共20分，每小题给出的选项中，有多项符合题目要求，全部选对的得5分，部分选对的得2分，有选错的得0分。
广东省湛江市第二十一中学2021-2022学年高一上学期期中考试生物试卷
三湛江市第二十一中学2021-2022学年度第一学期高一生物期中考试试卷时间:75分钟总分:100分一、选择题：本题共20小题，共40分。
1.蓝细菌与新冠病毒的相同之处是都具有（）A.拟核B.细胞骨架C.细胞膜D.遗传物质2.在生命系统的各个层次中，能完整地表现出各种生命活动的最微小的层次是（）A.细胞B.分子和原子C.种群和群落D.个体3．下列关于细胞学说及其建立过程的叙述，正确的项数是（）①细胞学说表明除病毒外，所有生物都是由细胞发育而来②细胞学说阐明了生物界的统一性，揭示了动物和植物的多样性③德国的魏尔肖提出“所有的细胞都来源于先前存在的细胞”④细胞学说完全由施莱登和施旺提出⑤细胞学说的建立过程中，施莱登和施旺运用了完全归纳法⑥细胞学说使人们对生命的认识由细胞水平进入到分子水平A.一项B.两项C.项D.四项4.某种植物细胞和某种哺乳动物细胞中的某些化学元素的含量(占细胞干重的质量分数：%)如下表所示。
下列有关叙述正确的是()元素C H O N P Ca S 植物43.57 6.2444.43 1.460.200.230.17动物55.997.4614.629.33 3.114.670.78A．C 的含量能说明有机物是动植物体内干物质的主要成分B．由表可知，两种生物体内所含化学元素的种类和含量差异很大C．测定该动物的某种小分子含C、H、O、N、S，此小分子不可能是氨基酸D．N、S 含量说明动物组织含蛋白质较多，H、O 的含量说明植物体内含水多5．开心果能适应严酷的生长条件，具有耐旱，抗热等特性，种子含有丰富的有机物、矿物质等，下列关于开心果植株细胞中元素及化合物组成的叙述，正确的是（）A.开心果植株细胞中结合水的比例比一般植物低B.缺铁植株易倒伏，说明无机盐能维持生物的正常生命活动C.开心果细胞中含量最多的化合物是蛋白质，H 原子数量最多D.细胞中的微量元素在细胞中含量很少，没有大量元素重要6．右图表示细胞内不同化学元素所组成的化合物,以下说法不正确的是()A.若图中①为某种生物大分子的基本单位,则①最可能是氨基酸B.若③存在于动物细胞的细胞膜上,则③是胆固醇C.若②存在于皮下和内脏器官周围等部位,则②是脂肪D.若④主要在人体肝脏和肌肉内合成,则④最可能是糖原7.生物体中作为生命活动的体现者、遗传信息的携带者、膜结构的主要成分的化合物，依次分别为（）A．糖类、脂类、核酸B．蛋白质、磷脂、核酸C．蛋白质、糖类、核酸D．蛋白质、核酸、磷脂8.下列有关蛋白质的结构的叙述中，正确的是（）A.一条多肽链分解成n条短肽链时，增加的羧基数为（n-1）B.蛋白质加热后会变性，就不能与双缩脲试剂发生颜色反应C.肽键的连接方式不同是影响蛋白质结构多样性的原因D.雄性激素是蛋白质类激素，其功能体现了蛋白质具有信息传递作用9.下列前项为生物组织，中项为鉴定所用的化学试剂，后项为反应结果所产生的颜色其中错误的是()A.苹果、斐林试剂、砖红色B.花生种子、苏丹皿染液、橘黄色C.黄豆、双缩脲试剂、紫色D.卵清蛋白、双缩脲试剂、蓝色10.下列关于核酸的叙述错误的是()A．RNA只分布在细胞质中，DNA只分布在细胞核内B．尿嘧啶是RNA特有的碱基，胸腺嘧啶是DNA特有的碱基C．RNA和DNA的基本组成单位是核苷酸D．生物的遗传物质是DNA或者是RNA11．下列关于生物膜结构探索历程的说法，不正确的是()A．最初的探索是通过对现象的推理分析得出细胞膜是由脂质组成的B．三层结构模型认为生物膜为静态的结构C．流动镶嵌模型认为构成膜的磷脂分子和大多数蛋白质分子可以运动D．三层结构模型和流动镶嵌模型都认为蛋白质分子在膜中的分布是不均匀的12.下列有关细胞膜的信息交流的说法，不正确的是()A．不同细胞之间必须相互接触才能传递信息B．能在细胞之间传递信息的物质并不都是激素C．高等植物细胞间的胞间连丝有信息交流作用D．细胞间的信息交流有利于整个生物体完成相应的生命活动13.下列有关组成细胞的分子和细胞结构的叙述，错误的是()A．人体成熟红细胞内没有线粒体，不能进行有氧呼吸B．磷脂、蛋白质和核酸是组成T2噬菌体、肺炎链球菌必不可少的有机物C．细胞骨架能维持真核细胞的形态，它与细胞的物质运输等活动有关D．生物体内中蛋白质的合成与核糖体有关14．假如你研究中发现一种新的单细胞生物并鉴定该生物的分类，以下何种特性与你的鉴定有关()①核膜的有无②核糖体的有无③细胞壁的有无④膜上磷脂的有无A.①③B.②④C.①④D.②③15.下列细胞器中，都不含磷脂的是（）A.线粒体和中心体B.核糖体和中心体C.核糖体和内质网D.高尔基体和内质网16.研究人员对取自四种不同生物的部分细胞(甲、乙、丙、丁)进行了分析、观察等实验，获得的结果如下表所示，则甲、乙、丙、丁四种细胞所代表的生物最可能是()项目核仁叶绿素叶绿体线粒体中心体核糖体纤维素酶处理的结果甲－＋－－－＋无变化乙＋－－－＋＋无变化丙＋－－＋－＋外层结构破坏丁＋＋＋＋＋＋外层结构破坏注：表中“＋”表示“有”，“－”表示“无”。
广东省湛江市第二十一中学2021-2022学年高一上学期期中考试化学试卷
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试回答下列问题：
（1）成功制备硅酸胶体的是_______同学，出现“光亮的通路”这种现象的名称是
。
（2）形成硅酸胶体的离子方程式为
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1．朱自清在《荷塘月色》中写道：“薄薄的青雾浮起在荷塘里……月光是隔了树照过来的，高处丛生的灌
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2021年湛江第一中学高三生物上学期期中考试试题及参考答案
2021年湛江第一中学高三生物上学期期中考试试题及参考答案一、选择题：本题共15小题，每小题2分，共30分。
每小题只有一个选项符合题目要求。
1. 水在生物体内的许多化学反应中充当（）A. 催化剂B. 还原剂C. 载体D. 溶剂2. 通过测交不可以推测被测个体()A.产生配子的种类B.产生配子的比例C.遗传因子组成D.产生配子的数量3. 下列有关人体细胞生命历程知识的叙述，不正确的是（）A.A TP水解酶基因表达的细胞不一定发生了分化B.原癌基因或抑癌基因发生突变，细胞就会发生癌变C.通过镜检观察细胞形态可作为诊断细胞癌变的依据之一D.有丝分裂、无丝分裂和减数分裂都可以发生在真核生物体内4. 红绿色盲属于伴x染色体隐性遗传病，下图为某家庭红绿色盲遗传的系谱图，结合图中信息及有关知识分析不正确的是（）A.随机人群中，男患者多于女患者B.3号个体携带的色盲基因来自于2号C.3号个体与女性携带者婚配，所生女儿患色盲的概率为1/4D.假设4号个体生育色盲儿子的概率为1/4，则其配偶不一定患色盲5. 在电子显微镜下，酵母菌和放线菌中都能观察到的结构是（）A. 细胞膜和细胞核B. 核糖体和线粒体C. 细胞膜和核糖体D. 拟核和细胞膜6. 下列关于孟德尔的遗传定律及其研究过程的分析，错误的是A.提出问题是建立在豌豆纯合亲本杂交和F1自交实验的基础上B.为了验证作出的假设是否正确，孟德尔设计并完成了测交实验C.孟德尔所作假设的核心内容是“性状是由位于染色体上的基因控制的”D.孟德尔遗传定律只适用于进行有性生殖的真核生物的核遗传7. 下列关于遗传学的基本概念的叙述,正确的是()A.测交后代都是纯合子B.隐性性状是指生物体不能表现出来的性状C.纯合子自交产生的F1所表现出来的性状就是显性性状D.性状分离是指杂种后代中显性性状和隐性性状同时出现的现象8. 下列各项所描述的物质肯定不含磷的是（）A.构成生物膜基本支架的物质B.为暗反应提供能量的物质C.合成遗传物质所需的原料D.细胞内的主要能源物质9. 正确选择实验材料和方法是得出正确结论的前提，下列有关实验材料或方法的选择，正确的是（）A.利用废旧物品制作的真核细胞模型——概念模型B.人鼠细胞融合实验研究生物膜的流动性——荧光标记法C.提取并研究细胞膜的化学成分——公鸡的成熟红细胞D.观察叶绿体和线粒体——人口腔上皮细胞10. 关于高等动物细胞(2N=12)增殖过程的叙述，错误的是A.若该动物某个细胞核DNA用32P标记，放在不含32P的培养基中培养，该细胞连续进行两次有丝分裂，每个子细胞含32P的核DNA占1/2B.染色体数为2N=12的原始生殖细胞在减数第一次分裂前期形成的四分体个数为6个C.有丝分裂中期和减数第二次分裂中期，染色体数和核DNA分子数之比都是1：2D.有丝分裂间期和减数第一次分裂前的间期，都进行一次染色质DNA的复制11. 普通小麦的卵细胞中有三个染色体组。
2021年湛江第一中学高三英语上学期期中考试试题及参考答案
2021年湛江第一中学高三英语上学期期中考试试题及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项ADuring ancient times, children didn’t have smartphones, iPad or computers to entertain themselves. Instead, they came up with interesting games to play.★Stone ballsDuring the Qing Dynasty, kicking a stone ball around was a popular sport in the northern part of China, and it was often played in the winter to protect kids from the cold. Stones were carved into small balls and kicked along with feet. In 1999, the sport was included in the 6th National Ethnic Group Traditional Sports Meeting held in Beijing.★Flying kitesKites have quite a long history. The earliest kites were made of wood, instead of paper. Nowadays, the four most famous kites are the Beijing kite, Tianjin kite , Weifang kite and Nantong kite, of which each has distinctive features. The kite which resembles a swallow is a well-known Beijing style.★Hide-and-seekHide-and-seek is a traditional game for children, popular around the nation. There are two ways to play: covering a child’s eyes while other kids run around to tease(戏弄) him or, more commonly, participants hide and one child must try to find them.★Playing diabolosA diabolo is always made of wood or bamboo and has empty space in the center. By juggling(边抛边接) the diabolo on the rope, the high-speed spinning diabolos will make a sound like a whistle. Playing diabolos is an interesting folk game, especially popular in North China. Playing diabolos was also included in the first group of national intangible cultural heritage(非物质文化遗产).1.Why did ancient children often play stone balls in the winter?A.To practice their feet.B.To warm themselves.C.To train their skills.D.To relax themselves.2.Which kites are swallow-shaped?A.Weifang kites.B.Tianjin kites.C.Beijing kites.D.Nantong kites.3.Why does playing diabolos make a sound?A.Because the diabolo’s center is empty.B.Because the high-speed spinning diabolo is light.C.Because the diabolo is equipped with a whistle.D.Because ropes’ surface moves against the diabolo’s.BResearchers say spicy tomatoes could soon be on the menu thanks to the rise of gene-editing technology.It's not the first time that experts have claimed techniques could develop fruit with unusual features: scientists have already been looking at changing the color1 of kiwi fruit and bettering the taste of strawberries.But researchers inBrazilandIrelandsay such methods could also offer practical advantages, with hot tomatoes offering a new way of harvesting the pungent chemicals found in peppers known as capsaicinoids, which make food taste “hot”.“Capsaicinoids are valuable. They are used as painkillers and there are some researches showing that they promote weight loss,” said Agustin Zsogon from a Brazilian university, a co-author of a new article arguing for the benefits of engineering hot tomatoes.Writing in the journal Trends in Plant Science, the researchers say peppers are difficult crops to grow and low productive. Worse still, it is tricky to keep the pungency of the fruits table. By contrast, tomato production is high and the plant is well-studied. “You could produce the capsaicinoids in a more cost-effective manner,” said Zsogon.Tomatoes and peppers developed from a common ancestor, but separated about 19 million years ago. “All these genes to produce capsaicinoids exist in the tomato, they are just not active,” said Zsogon. “Using gene-editing technology, it is likely to switch these genes back on in tomatoes, making the fruit more special”, he said.4. Why are the tomatoes made hot by the researchers?A. To test the gene-editing technologyB. To improve the amount of the tomatoesC. To explore ways to harvest more capsaicinoids.D. To make the tomatoes more delicious.5. For what purpose can capsaicinoids be used according to the text?A. To put on weight.B. To ease the pain.C. To improve sleep.D. To better the look.6. What is Zsogon's attitude to the gene-editing technology?A. Confident.B. Critical.C. Anxious.D. Doubtful.7. What's the main idea of the text?A. An introduction to gene-editing plants.B. Creating hot tomatoes by gene-editing.C. Problems with capsaicinoid production.D. The procedure of producing capsaicinoids.CA student had to get his long hair cut off in a middle school in GuangDong Province. It was talked a lot among teachers and students.In fact, all schools have their own rules. In most schools, boy students are not allowed to have long hair while girls are not allowed to dye their hair. And most school rules say that students should wear their school uniforms at school. And students must obey these rules so that they can get healthy development at school.But some students have disagreements. They think that boy students having long hair doesn't mean that they are not good students. They want to show their own personality. They think that they would look cool too if they had long hair and the hairstyles like their favorite stars.A girl student thought that she would look much more beautiful if she had brown hair. So she had her dark hair dyed brown one day. When she went back to school the next day, the teacher was very angry with her. She said that she worked hard at her lessons and did well in every subject. She just didn't know why the teacher didn't allow her to dye her hair while women teachers can.It is not wrong for teenagers to love stars' hairstyles or wear their favorite clothes. However, a school has its own rules for all the students to obey so that the school can be in good order. Students should not break the rules at school.8. What aren't boy students allowed to do in most middle schools according to this passage?A. To have long hair.B. To wear uniforms.C. To like famous stars.D. To show their own personalities.9. Why did the girl make her hair brown?A. Because she wanted to be cool.B. Because she thought that she would look much more beautiful.C. Because she wanted to make her teacher angry.D Because women teachers dyed their hair.10. What does the writer think of these school rules?A. The students should be against them.B. They are bad for students.C. They can make schools in good order.D. They can't make students grow healthily.11. What is the passage mainly about?A. Hair styles and clothes.B. Schoolboys and schoolgirls.C. Students and famous stars.D. School rules.DIf you could travel back in time, which period of history would you visit? It’s a great question to ask your friends, and time travel is the subject of many science fiction films. Of course, sci-fi is familiar to most of us, butwhat is cli-fi? The simple answer is climate fiction which focuses on the subject of climate change.Many of the cli-fi examples we watch tend to be disaster films. It could be solar flares (太阳耀斑), ice ages devastating (摧毁) the planet, extreme flooding swamping the earth with water, or super-storms that threaten life as we know it. While films and novels of this style are often subject to the typical images of a hero or heroine battling to save the day, what sets it apart from most sci-fi films is that the plots will often draw on apparently reasonable outcomes in the near future.Climate change and the potential threats have long been established. Some believe that the issue of climate change has even led to more fans watching films to learn more about what's happening to the world – seeing it as a form of edutainment. A study conducted by the Yale programme on Climate Change Communication tested the effects that two climate fiction novels can have on its readers and found “significant positive effects” in terms of their attitudes and beliefs towards the climate crisis – for example, understanding global warming will harm them and future generations.Most climate films are not only extremely popular action films, but also cause our fear of what some see as the approaching end of the world. This sounds bad, but according to a study conducted on 310 adults in the US, watching such scary films can help us feel more prepared and less alone in situations such as the pandemic (疫情). So, it looks like cli-fi is hereto stay – and there seem to be some benefits. Whether it’s there to educate, entertain or prepare you for a climate crisis, it might have a role to play.12. Which of the following may be the subject of cli-fi?A. Time travel.B. Global warming.C. Weather forecast.D. Economic climate.13. What can we learn about cli-fi films from paragraph 2?A. They are often about extreme natural disasters.B. They want to show that man can conquer nature.C. They usually have similar plots with sci-fi films.D. They can show the true near future of the world.14. Why is the study conducted by the Yale programme mentioned in paragraph 3?A. To prove that climate change has potential threats.B. To show that people like climate fiction novels.C. To tell that cli-fi novels have positive effects on readers.D. To explain how the climate crisis affect the human being.15. What does the writer mainly want to tell us in the last paragraph?A. Cli-fi films are very popular as action films.B. A study was conducted on 310 adults in theUS.C. The pandemic make people scared and alone.D. Cli-fi films are useful and will be here to stay.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。
广东省湛江市第一中学高一地理上学期期中试题(1)
广东省湛江市第一中学2021-2021学年高一地理上学期期中试题一．选择题（每题2分，共60分）“太阳大，地球小，太阳带着地球跑；地球大，月球小，地球带着月球跑。
”重温儿时的歌谣，完成1～2题。
1．童谣中显现的天体，按前后顺序排列的是A.恒星、行星、卫星B.星云、恒星、行星C.恒星、行星、小行星D.恒星、小行星、流星体2．童谣中显现的最低一级天体系统是A.总星系B.河外星系C.银河系D.地月系的是3．有关太阳系的表达，不正确．．．A．八大行星绕日公转的方向都是自西向东的B．木星和土星的体积、质量庞大，称为巨行星C．在火星轨道双侧，别离是地球和木星轨道D．嫦娥一号所在的最低一级天体系统是太阳系4. 太阳系（图1）中的小行星带位于以下哪一组行星的轨道之间A．C与 B B．C与D C．D与E D．E与F地球是太阳系中的一颗一般行星，但是地球贵在是一颗适于生物生存和繁衍的行星。
尽管咱们相信宇宙还会有能够繁衍生命的星球，可是至今为止咱们尚未发觉它们。
据此完成第5题。
5. 地球上有生物存在的温度条件，其成因是A．八大行星各行其道B．日地距离适中C．地球的体积适中D．地球的质量适中花是红色的，叶是绿色的，葡萄是紫色的。
咱们赞美它们的漂亮，它们的色彩，你们可曾想过是谁让江山如此多娇，如此迷人？是太阳，是金黄色的太阳！太阳源源不断地向地球辐射能量，阻碍着地球和人类的生产和生活。
据此回答6～7题。
6．太阳能量的来源是A．氢气燃烧B．氦气爆炸C．核聚变反映D．核裂变反映7．关于太阳辐射的表达不正确的选项是A．太阳辐射确实是指太阳以电磁波的形式向周围放射的能量B．太阳为地球提供光和热C．大部份的太阳辐射能抵达地球，对地球产生不可估量的阻碍D．太阳辐射能是增进地球上的水、大气、生物活动和转变的要紧动力我国古书曾记载有“公元前28年，三月乙末，日出黄，有黑气大如钱，居日中央。
”回答第8题。
8.古书记载中所提到的太阳活动及其成因是A．耀斑，该区域含有大量的水汽和尘埃B．耀斑，该区域温度比周围低C．黑子，是太阳表面的低压区域D．黑子，是太阳表面的低温区域9. 地球自转一周所需时刻为A．23小时56分4秒B．24小时56分4秒C．24小时D．24小时04分10. 关于地球自转速度的表达，正确的选项是A．地球任何地址的自转角速度都相等B．南北极点速度为0，其他各点角速度都约等于每小时15度C．南北两极点自转的角速度和线速度都是最大的D．同一经线上的各点自转的角速度和线速度均相等11. 以下骨气或月份中，地球公转速度最快的是A.7月初B.夏至日C.冬至日D.1月初12. 以下有关11月12日的天文现象，表达正确的选项是A.离地球公转的近日点愈来愈近，公转速度愈来愈快B.离地球公转的远日点愈来愈近，公转速度愈来愈快C.太阳直射点位于南半球，并向北移动D.北半球的昼永夜短，且昼长愈来愈长看图2，回答第13～14题。
2021年湛江第一中学高三英语期中考试试题及答案解析
2021年湛江第一中学高三英语期中考试试题及答案解析第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项ANothing beats live music, but the venue makes a difference. When you're able to score tickets to an incredible concert in an incredible place, you won't forget the experience. Here are some of the coolest music venues from around the world. If you haven't been to any of these, you've got some traveling to do.Red Rocks, Morrison, the United StatesRed Rocks might be the most beautiful and famous venue in the United States. At 6,450 feet above sea level, Red Rocks is a geologically formed natural stage. Its massive sandstone provides a perfect stage for jam bands. If you're into the blues and jazz, you'll have no trouble finding something in line with your interests.Meet Factory, Prague, Czech RepublicSmallest venues on this list, Meet Factory is an art gallery, theater, and music venue. The venue only accommodates 1,000 people, so you won't see any huge names come through. Still, it's a great place to see up-and-coming local acts, and if you've got an eye for contemporary art, you'll love your time here.Arena of NÎmes, NÎmes, FranceOriginally built around A. D. 70, the Arena of Nimes presents concertgoers with an interesting question: Should they enjoy the music, or marvel at the architecture? The Arena is, after all, one of the world's best-preserved Roman theaters. Many major touring acts plan stops at the Arena of Nimes, especially during the venue's annual festival.Sydney Opera House, Sydney, AustraliaThe Sydney Opera House is one of the world's most famous performing venues. I's also one of the most distinctive buildings in Sydney, thanks to the breathtaking design by Danish architect Utzon. It hosts about 40 events per week, so whether you're into jazz, rock, classical music, or opera, you'll find something to watch.1.Where can you enjoy music in natural beauty?A.At Red Rocks.B.At Meet Factory.C.At Arena of Nimes.D.At Sydney Opera House.2.What is special about Meet Factory?A.It enjoys breathtaking scenery.B.It hosts both musical and artistic events.C.It is the largest venue of all.D.It is famous for contemporary music.3.What do the listed music venues have in common?A.They have a long history.B.They are built near the sea.C.They accommodate thousands of people.D.They are beautiful tourist attractions.BFor our official holidays, like the National Holiday, many people'd like to go on a visit to some places of interest. Yesterday our class had a heated discussion about whether we should travel during holidays.One man's meat is another man's poison.Some students are for it. They think visitors can enjoy a good variety of scenery. Facing glorious(壮丽的) touristattractions, travelers may well broaden their eyes. At the same time, they can keep fit by walking on foot, and taste different delicious food that they can't get in their own hometowns. What's more, travelling can make a contribution to our economy development, mainly to the local economy development. Most travelers need to buy tickets to go to their destinations, thus traffic department will earn money. Travelers also need to sleep and eat, thus local hotels and restaurants also share benefits. Paying admission(门票费) benefits local governments. As for native farmers, they can benefit from selling local specialities to many travelers. In this case, money circulation(货币流通) is speeded up.On the other hand, other students are against it. They believe it's a waste of money. Some famous places of interest are too crowded, while those smaller ones are not worth visiting. Travelling may cause traffic jams here and there. What's worse, due to travelling here and there, there exist some accidents on the road. Besides, it's known that travelling can also pollute the local environment. In order to reduce air and waste pollution, people should have a rest to the full, reading books or watching TV at home. Recently, many have been afraid of being infected with COVID-19 in particular.As far as I am concerned, travelling is a good choice to spend holidays. And the government should take some measures to solve the existing problems. More policemen should be on duty to deal with accidents in time. Can we make a small change to the period when people don't have to go to work in some provinces? Let's take the example of the National Holiday, if some provinces of our country spend this holiday mainly in late September, with the National Day coming to an end, rather than in earlyOctober, most famous places of interest will not become crowded. At the same time, visitors must obey traffic rules and shouldn't throw rubbish freely here andthere. Last but not least, never should we travel when there is a pandemic(大流行病，瘟疫). It's our duty to prevent its spread.4. What does the underlined sentence “One man's meat is another man's poison” in this passage mean?A. Some persons like meat, while others don't.B. Different persons taste meals differently.C. A man mistakes meat for poison.D. Different persons have different opinions on one thing.5. How do travelers contribute to our economy development?A. They buy all kinds of tickets.B. They walk, sleep, eat and meet native farmers.C. They speed up money circulation by spending money on transport, accommodations(膳宿), specialities and admission.D. They only enjoy visiting many glorious tourist attractions.6. Which sentence of the following is not true?A. There's a need for more policemen.B Some provinces can change the date of an official holiday completely.C. Visitors must obey traffic rules and shouldn't throw rubbish freely.D. People should never travel when there is a pandemic.7. What the author's attitude to travel during holidays?A. He doesn't show his opinion.B. He doesn't agree at all.C. He supports unconditionally.D. He supports and makes some suggestions.COne Sunday morning, my family and I went to a popular restaurant for breakfast. As soon as we walked into Restaurant Happy Meal, a young waitress showed us to a table.We ordered our food and soon after, our food came. Just as we were about to begin our meal, we heard someone shouting for the boss.“What is this? A dead fly in my food!’’ a man with a deep scar (疤) acrosshis face shouted angrily. He strongly hit his fist on the table and swept the plates and cups off it.Thesecame crashing to the floor, breaking into pieces. His companion, a huge man with a tattoo on his arm, stared angrily at the boss who stood nervously in front of the two gangsters (歹徒).The boss apologized repeatedly to the angry customers and tried to calm them down by offering to replace their food. He even told them that they could have their meal for free.The commotion(混乱) affected the business of the restaurant. Fearing that aquarrel would happen, many customers quickly paid for their meals and left the restaurant hurriedly. Some of them had not even finished their breakfast.My father told us to eat our food quickly and not to look at the two angry men. We obeyed him and finished our food within minutes. That was probably the quietest and fastest breakfast my family ever had.Although my father warned us not to look at the two unruly (任性的) customers, I could not help stealing a glance at them.I saw that the boss had managed to calm the two angry customers. Fresh food and drinks were brought to their table. They sat down again and continued their breakfast. Meanwhile the waitress who had shown us to our table earlier swept up the broken china.8. What does the underlined word “These” refer to?A. Tables.B. Cups and plates.C. Two angry customers.D. Dead fly and the food.9. What can we know about the owner from paragraph 4?A. He was sorry for what had happened.B. He was angry with the two customers.C. He was pardoned by the two customers.D. He was disappointed that the men caused problems here.10. What can we infer about the writer and his family?A. They might often talk while they ate.B. They ordered a lot of food each time they ate out.C. They often ate silently and that day was no exception.D. They usually did not like to be disturbed while they ate.11. What did the writer think of the boss?A. Foolish.B. Active.C. Hardworking.D. Wise.DSix Neanderthals who lived in what is now France were eaten by their fellow Neanderthals some 100,000 years ago, according to fearful evidence of the cannibalistic (食人的) event discovered by scientists in a cave in the1990s. Now, researchersmay have figured out why the Neanderthals, including two children, became victims of cannibalism: Global warming.While previous studies have examined Neanderthal remains to find proof of cannibalistic behavior, this is the first study to offer clues as to what may have led Neanderthals to become cannibals. Scientists found that rapid changes in local ecosystems as the planet warmed may have wiped out the animal species that Neanderthals ate, forcing them to look elsewhere to fill their stomachs.The researchers examined a layer of sediment (沉积物) in a cave known as Baume Moula-Guercy, in southeastern France. In that layer, charcoal (碳) and animal bones were so well-preserved that scientists could reconstruct an environmental picture representing 120,000 to 130,000 years ago. They discovered that the climate in the area was likely even warmer than it is today, and that the change from a cold, dry climate to a warmer one happened quickly. “Maybe within a few generations”, study co-author Emmanuel said. As the animals that once populated the landscape disappeared, some Neanderthals ate what they could find — their neighbors.Cannibalism is by no means unique to Neanderthals, and has been practiced by humans and their s “from the early Palaeolithic to theBronze Age and beyond,” the study authors reported. The behavior adopted by the starving Neanderthals in the Baume Moula-Guercy should therefore not be viewed as “a mark of bestiality (兽性) or sub-humanity”, but as an emergency adaptation to a period of severe environmental stress, according to the study.12. What does the study mainly focus on?A. The social behavior of Neanderthals.B. The reason for cannibalism among Neanderthals.C. The climate change in southeasternFrance.D. The influence of global warming on ancient animals.13. What can possibly be used to describe the climate in southeasternFrance120,000 to 130,000 years ago?A. It was no warmer than it is today.B. It was first warm while later cold and dry.C. Its change was mild and went through quite a long process.D. Its change is a chief factor contributing to cannibalism.14. Which of the following might the study authors agree with?A. Neanderthals’ cannibalism showed their bestiality.B. Cannibalism was actually a measure the Neanderthals had to adopt to survive.C. Neanderthals’ cannibalism guaranteed their rule over other tribes.D. Only Neanderthals were found to have cannibalism in human history.15. Where can you most possibly find this passage?A. In a science journal.B. In a travel brochure.C. In a history book.D. In a geography book.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。
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黄梅一中高一上学期化学期末测验
一、选择题（每小题3分，共60分）每小题只有1个选项符合题意。
1、还原剂①反应中得电子的物质,②反应中失电子的物质,③反应过程中有元素化合价升高的物质,④反应过程中有元素化合价降低的物质.正确的组合是 ( )
A.②③
B.①④
C.①③
D.②④
2、碘缺乏病是目前已知的导致人类智力障碍的主要原因，为解决这一全国性问题，我国已
经开始实施“智力工程”，最经济可行的措施是（）A．食盐加碘B．饮用水加碘C．大量食用海带D．注射含碘药剂
3、下列物质长期露置于空气中会变质，但不是发生氧化还原反应的是（）
A．Na B．NaOH C．Na2CO3D．氯水
4、检验稀碘水和稀溴水时，所用的最佳试剂是（）
A．淀粉溶液B．氯水C．NaOH溶液D．NaBr溶液
5、下列各组全部是弱电解质的是：（）
A、HClO、HF、CH3COOH
B、H2SO4、HNO3、HBr
C、H2CO3、CaCO3、HClO
D、NH3·H2O、CH3COONH4、H3PO4
6、在酸性溶液中能大量共存，并且溶液为无色透明的是（）
A．Na+、K+、Cu2+、SO42－B．NH4+、Na+、NO3－、Cl－
C．K+、Ca2+、HCO3－、Cl－D．Mg2+、Fe3+、Cl－、OH－
7、下列离子方程正确的是：（）
A、Fe2++Cl2=Fe3++2Cl-
B、F2+H2O=H++F-+O2
C、2Fe2++Cl2=2Fe3++2Cl-
D、Fe3++Cu=Fe2++Cu2+
8、已知甲烷和氧气的混合气体中，甲烷的质量分数为20％，则甲烷和氧气的体积比为
A．1∶4 B．1∶5 C．1∶4.5 D．1∶2
9、可恰好还原1克H+的是（）
A、34克OH-
B、80克Br2
C、9克Al
D、24克Mg
10、在 2H2S+SO2==3S+2H2O中，被氧化物质与被还原物质的物质的量之比是（）
A、1：2
B、2：1
C、3：1
D、3：2
11、下列溶液中不存在氯离子的是（）
A、氯水
B、氢化氢溶液
C、漂粉精溶液
D、氯酸钾溶液
12、某银白色金属A露置于空气中颜色逐渐变灰而生成B，B表面逐渐形成液态的C，最
后C又变成白色粉末状D。
取D在无色火焰上灼烧，有黄色火焰。
下列各组物质中，按A、B、C、D顺序排列的是（）A．K、K2O、K2CO3、KHCO3B．Na、Na2O2、NaOH、Na2CO3
C．K、K2O、KOH、K2CO3 D．Na、Na2O、NaOH、Na2CO3
13、在甲、乙、丙、丁四个烧杯中分别加人0.lmolNa、Na2O、Na2O2、NaOH，然后各加入
100mL水，搅拌，使固体完全溶解，则甲、乙、丙、丁四个烧杯的溶液中含NaOH的质量分数大小顺序正确的是（）A．丁＞丙＞乙＞甲B．丙＝乙＞甲＞丁
C．丙＝乙＞丁＝甲D．丙＞乙＞甲＞丁
14、在下列反应过程中，有3mol电子转移的是（）
A．lmol钠与水反应
B．27g铝与足量盐酸反应
C．22.4L氧气（标准状况）与足量镁反应
D．1.5mol Na2O2与足量水反应
15、将一定量的NaHCO3和Na2CO3的混合物加热到不再放出气体时，收集到CO2 aL，冷
却后向。
残余物中加入足量盐酸又收集到CO2 2aL（体积均在标准状况下测定）。
则混合物中Na2CO3和NaHCO3的物质的量之比为（）A．1∶1 B．1∶2 C．1∶3 D．1∶4
16、甲乙两烧杯中分别盛有等体积，等物质的量浓度的盐酸和稀硫酸，分别投入等物质的量
的锌粒，充分反应后，不可能出现的情况是（）
A、甲、乙两烧杯中，锌粒均有剩余
B、甲、乙两烧杯中，锌粒均溶解完
C、甲烧杯中锌粒溶解完，乙烧杯中锌粒有剩余
D、甲烧杯中锌粒有剩余，乙烧杯中锌粒溶解完
17、在密闭容器中盛有H2、O2、Cl2的混和气体，通过电火花点燃，3种气体正好恰好完全反应，冷却至室温后，所得液体产物浓度为25.26%，则容器中原有H2、O2、Cl2的分子个数比是（）
A、6：3：1
B、9：6：1
C、13：6：1
D、10：6：1
18、不能用碘化钾淀粉试纸鉴别的一组溶液是（）
A、氯水、氯化钠
B、碘水、碘化钾
C、氯水、碘水
D、溴水、溴化钾
19、下列说法正确的是（）
A、单质都是由原子构成的
B、纯净物都是由同种分子组成的
C、化合物都是由同种分子构成的
D、混合物都是由不同种物质组成的
20、在密闭容器中充入CO2和CO的混合气体，其密度是相同条件下氦气的密度的8倍，这
时测得容器内压强为p1。
若控制容器的体积不变，加入足量的Na2O2，充分振荡并不断用点火花点燃至反应完全，恢复到原来的温度，再次测得容器内的压强为p2，则p1和p2的关系为（）
二、境空题（共29分）
21．（9分）新制的氯水显色，说明氯水中有分子存在。
向氯水中滴入几滴AgNO3溶液，立即有生成，说明氯水中有存在。
蓝色石蕊试纸遇到氯水后，首先变红，但很快又褪色，这是因为。
氯水经光照后，黄绿色消失，并放出无色的气，该反应的化学方程式是。
22（5分）在K2Cr2O7+14HCl=2KCl+2CrCl3+3Cl2↑+7H2O反应中,
________是氧化剂，________是氧化产物，此反应中HCl表现出的性质有_________还有_________，这两部分的质量比为_________。
23．（5分）相同条件下，同质量的X、Y两种气体，相对分子质量分别为A、B，则它们的体积比为，分子个数比为，密度比为；相同条件下的X、Y两种气体体积相同，则X：Y的质量比为，物质的量比为。
24．（2分）将一瓶集满HCl气体的烧瓶倒置在水中，最终瓶中溶液浓度为_______mol/L(假设瓶中液体不扩散，气体为标准状况下所集)
25．（2分）在标准状况下，氯气的密度约为___________________。
26．（6分）现有A-F六种无色未知溶液，他们是Na2CO3、BaCl2、KI、Ca(NO3)2、AgNO3、
和稀H2SO4,将瓶内溶液各取少量两两混合，实验结果如图
所示，图中“—”表示无明显变化或生成微溶物。
请写出
这六种溶液的化学式。
A________,B_______,C_______
D________,E_______,F_______
三．实验题（共16分）
27．（9分）请利用下列装置及试剂组装一套装置。
其流程是，先制取纯净干燥的Cl2（不收集），后试验干燥的Cl2和潮湿的Cl2有无漂白性。
试回答：
（1）按气体从左向右流向将各装置依次连接起来（填接口标号）： a 接，接，接，接，接。
（2）烧瓶中发生反应的化学方程式是。
（3）D装置的作用是，E装置的作用是，F装置的作用是。
28．（7分）已知Na2S2O3可与HCl溶液反应，生成SO2,S,NaCl,H2O,某同学按下列程序进行实验。
Ⅰ制备HCl气体，Ⅱ通入Na2S2O3溶液中，Ⅲ生成的气体通入含BaCl2的氯水
①在下列仪器中：⑴圆底烧瓶⑵集气瓶⑶酸式滴定管⑷酒精灯⑸普通漏斗⑹烧杯⑺量筒⑻
锥形瓶⑼长颈漏斗⑽分液漏斗⑾铁架台⑿水槽
在第Ⅰ步操作中选用的仪器有____________________
在第Ⅱ步操作中选用的仪器有____________________
在第Ⅲ步操作中选用的仪器有____________________
②组装完气体发生装置后，按正确的顺序写出制备HCl气体的主要操作顺序
___________________________________________________________________________ ___________________________________________________________________________
③写出第Ⅲ步操作中发生的反应的离子方程式_____________________________________
④第Ⅱ步操作中可观察的现象为_________________________________________________ 四．计算题（15分）
29．(8分)将10.000g的氯化钠、溴化钾和氯化钙的混合物溶于水中，通入氯气充分反应，然后把溶液蒸干并灼烧后残留物的质量为9.813g，若将此残留物再溶于水并加入足量的碳酸钠溶液，所得的沉淀经干燥后质量为0.721g求原混合物中各化合物的质量。
30．（7分）将7.0gNa2O2和Na2O的混合物跟9.8g水充分反应后，所得NaOH溶液中含NaOH的质量分数为50%，试计算原混合物中Na2O2和Na2O的质量。