英文英语数学题小学初中21
英语数词题20套(带答案)
英语数词题20套(带答案)一、初中英语数词1．— It's excited to hear that Jessie J got the King of Singer in the end.— Yes, it's her _____ time to get the first prize.A. sixB. sixthC. the sixD. the sixth【答案】 B【解析】【分析】句意：——很高兴听到杰西J最终获得了歌手之王。
——是的，这是她第六次获得一等奖。
根据句意可知此句需要序数词，因前面有物主代词her，定冠词the要省略，故选B。
【点评】考查序数词的基本用法。
2．The number of the students in our school is about four __________._______ of them are girls.A. thousand; Two thirdsB. thousands; Two thirdC. thousands; Two thirdsD. thousand; Two third【答案】 A【解析】【分析】句意：我们学校的学生人数大约是四人。
三分之二是女孩。
four基数词后用thousand的原形，分数表达形式是分子是基数词，分母是序数词，分子大于一，分母用复数形式，故三分之二是two thirds，故选A。
【点评】考查数词，注意分数的用法。
3．The TV was invented around .A. the twenty centuryB. the twentieth centuryC. twentieth centuryD. twenty century 【答案】 B【解析】【分析】句意电视大约是在二十世纪发明的。
二十世纪也就是第二十个世纪，因此使用序数词，序数词前必须使用定冠词the，故答案是B。
【点评】考查数词，注意序数词再具体语境中的运用。
小升初英语数词练习题50题含答案解析
小升初英语数词练习题50题含答案解析1.There are______ books on the desk.A.threeB.fourC.fiveD.six答案解析：A。
题干中“books”为复数，说明数量大于一。
选项B“four”、选项C“five”、选项D“six”虽然也都是数字，但不符合题干的情境设定。
选项A“three”可以合理地表示书桌上有三本书。
数词“three”为基数词，表示数量三。
2.My sister is______ years old.A.sevenB.eightC.nineD.ten答案解析：B。
根据常识，选项A“seven”七岁有点小，选项C“nine”九岁和选项D“ten”十岁不太符合一般设定。
选项B“eight”八岁比较合理。
数词“eight”为基数词，表示数量八。
3.I have______ pencils in my pencil case.A.oneB.twoC.threeD.four答案解析：C。
选项A“one”一支铅笔有点少，选项B“two”两支铅笔也不太符合常理，选项D“four”四支铅笔可能有点多。
选项C“three”三支铅笔比较适中。
数词“three”为基数词，表示数量三。
4.There are______ people in my family.A.threeB.fourC.fiveD.six答案解析：B。
一般家庭有父母和孩子，选项A“three”三个人有点少，选项C“five”五个人有点多，选项D“six”六个人也不太符合一般家庭人数。
选项B“four”四个人比较合理。
数词“four”为基数词，表示数量四。
5.I am______ years old.A.elevenB.twelveC.thirteenD.fourteen答案解析：A。
根据一般小升初学生的年龄，选项B“twelve”十二岁有点小，选项C“thirteen”十三岁和选项D“fourteen”十四岁又有点大。
小升初英语数词练习题30题含答案解析
小升初英语数词练习题30题含答案解析1. There are ______ students in our class.A. forty - fiveB. fourty - fiveC. forty fiveD. fourty five答案：A。
解析：在英语中，“45”的正确写法是“forty - five”，其中“forty”是四十的正确拼写，B和D选项中“fourty”拼写错误，C选项没有连字符，不符合数词的正确书写形式。
2. My sister is ______ years old.A. twelveB. twelvethC. twelthD. twelfe答案：A。
解析：表示年龄用基数词，“12”的基数词形式是“twelve”，B选项“twelveth”是“twelve”的错误拼写，C选项“twelth”是“twelfth”（ 第十二）的错误拼写，D选项“twelfe”也是错误形式。
3. I have ______ books on my desk.A. sixB. sixthC. the sixD. sixs答案：A。
解析：描述书的数量用基数词，“6”的基数词是“six”，B选项“sixth”是序数词 第六），C选项“the six”这种表达错误，D选项“sixs”复数形式错误。
4. There are ______ days in a week.A. sevenB. sevensC. seventhD. the seven答案：A。
解析：表示一周有七天，用基数词“seven”，B选项“sevens”这种形式不存在，C选项“seventh”是序数词（ 第七），D选项“the seven”表达错误。
5. My father bought me ______ pencils.A. tenB. tenthC. the tenD. tenes答案：A。
解析：表示铅笔的数量用基数词，“10”的基数词是“ten”，B选项“tenth”是序数词 第十），C选项“the ten”表达错误，D选项“tenes”复数形式错误。
小升初英语数字运算单选题50题及答案
小升初英语数字运算单选题50题及答案1.There are 20 apples. Tom eats 5 apples. How many apples are left?A.10B.15C.25D.30答案：B。
一共有20 个苹果，汤姆吃了5 个，用减法，20 - 5 = 15。
A 选项10 是错误的，因为20 - 10 = 10 与题目不符；C 选项25 是错误的，20 + 5 = 25，题目是求剩下的苹果，不是增加后的数量；D 选项30 是错误的，20 + 10 = 30，同样与题目不符。
2.Mary has 12 pencils. She gives 4 pencils to her friend. How many pencils does Mary have now?A.8B.16C.20D.24答案：A。
玛丽有12 支铅笔，给了朋友4 支，用减法，12 - 4 = 8。
B 选项16 是错误的，12 + 4 = 16，题目是求剩下的铅笔数量不是增加后的数量；C 选项20 和D 选项24 都与题目不符，12 加上一个数不等于20 或24。
3.There are 30 students in a class. 15 students are boys. How many girls are there?B.15C.20D.25答案：B。
班级里有30 个学生，15 个是男生，那么女生数量是30 - 15 = 15。
A 选项10 是错误的，30 - 20 = 10，与题目不符；C 选项20 和D 选项25 也都与题目不符。
4.Jack has 8 candies. He gets 4 more candies. How many candies does he have now?A.4B.12C.16D.20答案：B。
杰克有8 颗糖，又得到4 颗，用加法，8 + 4 = 12。
A 选项4 是错误的，8 - 4 = 4，题目是求现在一共有多少糖不是减少后的数量；C 选项16 和D 选项20 都与题目不符，8 加上4 不等于16 或20。
小升初英语数词练习题30题(带答案)
小升初英语数词练习题30题(带答案)1. There are ____ students in our class.A. forty - fiveB. fourty - fiveC. forty - fiveesD. fourty - fivees答案：A。
解析：基数词“45”的正确写法是“forty - five”，B选项“fourty”拼写错误，C和D选项中“fivees”这种形式是错误的，不存在这样的数词形式。
2. The answer of 20 + 30 is ____.A. fivetyB. fiftyC. fiveteenD. fivety - five答案：B。
解析：20加30等于50，“50”的正确英语是“fifty”，A 选项“fivety”拼写错误，C选项“fiveteen”不存在这种数词，D选项“fivety - five”也是错误的组合。
3. My sister is ____ girl in the family.A. the secondB. secondC. twoD. the two答案：A。
解析：这里表示顺序“第二个”，在英语中表示顺序时要用“the + 序数词”的形式，B选项缺少“the”，C选项“two”是基数词，D选项“the two”这种表达顺序是错误的。
4. There are ____ days in a week.A. sevenB. seventhC. sevensD. the seven答案：A。
解析：这里是说一周有7天，需要用基数词“seven”，B选项“seventh”是序数词，C选项“sevens”这种形式不存在，D选项“the seven”这种表达是错误的。
5. I have ____ pencils.A. twelveB. twelvethC. the twelveD. twelves答案：A。
解析：这里表示“我有12支铅笔”，用基数词“twelve”，B选项“twelveth”拼写错误，C选项“the twelve”这种表达是错误的，D 选项“twelves”这种形式不存在。
英语数词题20套(带答案)含解析
英语数词题20套(带答案)含解析一、初中英语数词1．A year is divided into ______ months. September is the _____ month of the year.A. twelve, ninthB. twelve, ninethC. twelfth, ninthD. twelfth, nineth 【答案】 A【解析】【分析】句意：一年分为十二个月。
九月是一年中的第九个月。
第一个空格后有month，月，可数名词复数monthes，其前要用基数词表示数量。
twelve十二；第二个空格前有定冠词the，空格后有可数名词month，单数，要用序数词表示顺序。
要用ninth第九。
根据故选A。
【点评】考查基数词和序数词。
注意基数词表示数量，序数词表示顺序。
2．______ of the students in our school are boys.A. Two threeB. Second threeC. Two thirdsD. Two third【答案】 C【解析】【分析】句意：我们学校的学生中有三分之二是男生。
分数词是分子是基数词，分母是序数词，分子大于一，分母加s，因此二分之一是two thirds，故选C。
【点评】考查分数，注意分子是基数词，分母是序数词，分子大于一，分母加s的用法。
3．—How old is your daughter?— ______. We had a special party for her ______ birthday yesterday.A. Nine; nineB. Nine; ninthC. Ninth; ninthD. Ninth; nine【答案】 B【解析】【分析】句意：——你的女儿多大了？——九岁，昨天我们给她过了一个特殊的九岁的生日聚会。
第一空说明年龄，应使用基数词，第二空说明的是第几个生日，使用序数词，故答案是B。
小升初数学问题解决英语阅读理解25题
小升初数学问题解决英语阅读理解25题1<背景文章>There are ten children in a class. The teacher brings in twenty apples. If each child gets an equal number of apples, how many apples will each child get?The children are very excited to see the apples. They start to think about how many apples they will get. Some children think they will get two apples, while others think they will get three. But they all know that they will get an equal number of apples.So, let's do the math. Twenty apples divided by ten children equals ___ apples for each child.Now, let's think about another situation. If there are fifteen children and thirty apples, how many apples will each child get? Again, we need to divide the total number of apples by the number of children. Thirty apples divided by fifteen children equals ___ apples for each child.>1. In the first situation, each child will get ___ apples.A. oneB. twoC. threeD. four答案：B。
小升初英语数字运算单选题80题(答案解析)
小升初英语数字运算单选题80题(答案解析)1.There are five apples on the table. Tom takes two apples. How many apples are left on the table?A.threeB.fourC.sixD.seven答案：A。
桌子上有五个苹果，汤姆拿走两个，5-2=3，所以还剩下三个苹果。
B 选项是四个，C 选项是六个，D 选项是七个，都不符合题意。
2.Lily has three pencils. She buys two more pencils. How many pencils does she have now?A.oneB.fourC.fiveD.six答案：C。
莉莉有三支铅笔，又买了两支，3+2=5，现在她有五支铅笔。
A 选项是一个，B 选项是四个，D 选项是六个，都不符合题意。
3.There are eight balloons. Some balloons burst. Now there are five balloons. How many balloons burst?A.oneB.twoC.threeD.four答案：C。
有八个气球，一些气球破了后还剩下五个，8-5=3，所以有三个气球破了。
A 选项是一个，B 选项是两个，D 选项是四个，都不符合题意。
4.Jack has six stickers. He gives away three stickers. How many stickers does he have left?A.twoB.threeC.fourD.five答案：B。
杰克有六个贴纸，送出去三个，6-3=3，所以还剩下三个贴纸。
A 选项是两个，C 选项是四个，D 选项是五个，都不符合题意。
5.Mary has four candies. She gets two more candies. How many candies does she have in total?A.fiveB.sixC.sevenD.eight答案：B。
英语数学题(英文)
英语数学题班级：姓名：1、Today is Thursday, what day is 101000 days later?2、The number of boys and girls in a class is equal, one fifth of the students who likefootball are girls, and the boys like football are one quarter of the whole class.There are 21 girls who are not fond of football, then ( ) boys like football.3、The train go through a bridge with 22 seconds which length is 82 meters , if thetrain’s speed double, it go through 706 meters’bridge with 50 seconds, the length of the train is ( ).4、Written on the blackboard several consecutive natural numbers from thebeginning of 1 1,2,3,4,...... , then wipe one of them, the average number of the9, the wiped natural number is ( ).remaining number is 13135、The maximum score on a test is 100, A got 94 points, B was the first name, C gotthe average score of A and D, D got the average of A,B,C,D and E, E was two more points than C who was the second place, then B got ( ).6、Subtract one half of 1999 from it, and then subtract one third of the rest, and thensubtract one quarter of the remaining,...... , finally subtract one 1999th of the remaining , then the result is ().7、There are forty drums, each big drums can hold oil 5 kg, each small oil can hold 3kg, big drums hold more than 24 kg than small drums, so big drums have( ), small oil have ( ).8、A, B, C run towards the same direction at the same time along the circular trackwhich circumference is 900 meters. A run 360 meters per minute, B run 300meters per minute, C run 210 meters per minute. They will meet ,at least A run ( )ring, B run ( ) ring, C run ( ) ring.9、Divide 200 into two natural numbers, one is a multiple of 17, and the other is amultiple of 23, the product of the two natural numbers is ( ).10、Equipped A, B two pipes with a pool, after 15 hours the pool will be filled withwater. If only open A pipe with 6 hours, B pipe with 8 hours, it can only hold nine twentieths of the pool. Open A pipe alone with( ) hours, B pipe alone with ( ) hours can fill the whole pool.11、Alice and Bob to participate in a get-together. At the get-together, Alice foundthe number of the students without glasses is 2 times of the number withglasses, Bob found the number of the students with glasses is two thirds of the number without glasses. ( ) students attend the get-together.12、Sold as the price it can get 960 yuan profit, if sold as 80% of the price, the loss is832 yuan, the purchase price of the goods is ( ) yuan.13、Display the circles with the same radius as shown below, the first figure with sixsmall, the second graphics with 10 small, the three graphics with 16 small, the four graphics have 24 small... In turn, the law, ( ) small in the sixth graphics.14、Place the five square piece of paper with the side length of 10 cm as shownbelow, each small square piece of paper is covered with a small square, its lengthis half of the original length of a side of the square, the outer contour (Fig. thick lines) perimeter is ( ) cm.15、As shown, in the figure below, there is a point P ,its distance toAB, BC, CD,DA, are the same 6cm.If the perimeter of thequadrilateral ABCD is 57 cm, the area of the quadrilateralABCD is ( ) square.16、Hundreds of years ago, Columbo discovered the new America continent, theyear of the four figures are not the same, and they are equal to 16. If the tens digit plus one, then the tens digit is exactly equal to 5 times ones digits, then Columbo discovered the new America continent in AD ( ).17、School organize a visit to Xuanwu Lake, Dr. Sun Yat Sen's mausoleum, thepresidential palace, now asking each class at least to one tour, up to two tours, then at least ( ) classes to attend ensuring that there are two class ofsightseeing place exactly the same.18、A, B want to buy a commodity, in accordance with the price, A is lack of 40 yuan,B is lack of 14 yuan, after bargain finally it deal with 10 percent off, so theybought one and 28 yuan left. How much is the price of the product?19、If for A, B, C ,they are prime numbers, A＋B＋C＋A×B×C＝99, so what is thedifference between the maximum number and the minimum number of three numbers?20、Using 1.2.3.4.5.6.7.8 numbers 4 boys and 4 girls, asking the number of boys withodd number, the girls with even number, so how many methods?21、A boat round-trip from one place to another spends two hours, backdownstream is 8 km per hour than upstream, so traveling distance in the second hour is 6 km longer than in the first hour. What is the distance between A and B?22、A/2002 is one of the most simple truth scores, then, how many A can meet therequirement?23、The average of 7 natural numbers is about 30.23, and the last digit is wrong, sowhat is the correct approximate mean value?24、A, B, C repair the road, A and B spend 5 days to complete all the works. B and Cspend 2 days to complete the remaining, and then A, C spend 5 days tocomplete all. If the entire project is paid 600 yuan, then how much B should be paid?25、If a, b, c are natural numbers which are not equal to each other and greater than0, a＋b＋c＝1155, what is their maximum value of greatest common divisor?What is the minimum value of minimum common multiple?26、A book page is continuous natural numbers 1, 2, 3,... , when add the pagesnumber together, a page number is added two times, getting the incorrectresults 1991.What is the twice added number?27、A project arrangements 50 people for 30 days to finish, now arrange 24 peoplefor 10 days, assuming the same working efficiency per person ,if it mustcomplete the task on schedule, how many people should arrange later?28、There are small wooden sticks with length of 1 cm, 2 cm, 3 cm, 4 cm, 5 cm , takeeither 3 form a triangle, how many triangles can be formed?29、There are 80 beads, five years ago, the two sisters distributed according to theproportional of age, just finished. This year, they again distributed according to the proportional of age, and just finished. It is known that the older sister is two years older than her younger sister, then how many pieces difference did the older sister in two times?30、A person has contracted an orchard, the number of workers a day (in the yuanas a unit), just the same as the number of workers. If you cut 3 workers, and the total wages paid the same per day, so that every worker's wages increased by 3.1 yuan. How many yuan per worker?。
解析英语数字相关练习30题
解析英语数字相关练习30题11. 《解析英语数字相关练习30 题》亲爱的同学们，英语数字的学习在我们的英语学习中占据着重要的地位。
它不仅是日常生活交流的基础，也是各种考试中经常出现的考点。
熟练掌握英语数字的相关知识和解题技巧，对于提高我们的英语综合能力至关重要。
2. 首先，让我们来看第一道题。
这是一道关于数字拼写的题目，要求我们准确写出给定数字的英文单词。
比如“15”，很多同学会写成“fiveteen”，这是错误的，正确的写法应该是“fifteen”。
再看第二道题，是关于数字读法的，“23”应该读作“twenty-three”，而不是“two three”。
像这样的拼写和读法错误是同学们经常容易犯的。
考查了数字在句子中的运用。
比如“There are five apples on the table.”这里要注意数字“five”和后面名词“apples”的搭配。
还有“I'm sixteen years old.”中数字“sixteen”要与“years old”连用，表示年龄。
“The price of this book is fifty yuan.”这里“fifty”的使用要符合句子的语境和语法规则。
还有一些涉及到数字的比较和运算。
比如“Which is larger, ten or twenty?”这就需要我们清楚数字的大小关系。
关于日期、时间、电话号码等的表达也是常见的考点。
例如“Mybirthday is on May 1st.”中“1st”的写法和读法要准确。
同学们一定要多加注意。
在平时的学习中，要多做练习，多读多写，不断强化记忆。
8. 总结一下这30 道题的解题技巧。
首先，要牢记基本的数字词汇和表达方式。
其次，要认真分析题目中的语境和语法要求。
最后，做完题目后要仔细检查，确保数字的拼写、读法和运用都没有错误。
只有通过不断地练习和积累，才能真正掌握。
希望同学们能够认真对待这30 道题，从中吸取经验教训，提高自己的英语数字水平。
小升初英语数词练习题30题(答案解析)
小升初英语数词练习题30题(答案解析)1.There are ____ books on the desk.A.fiveB.sixC.sevenD.eight答案解析：A。
本题考查基数词的用法。
首先分析各个选项，B 选项six 是“六”；C 选项seven 是“七”；D 选项eight 是“八”。
而题干中说桌上有一些书，根据常识或者具体情境设定，通常情况下桌上有五本书比较合理。
所以选择 A 选项five。
2.I have ____ pencils in my pencil case.A.threeB.fourC.twoD.one答案解析：B。
A 选项three 是“三”；C 选项two 是“二”；D 选项one 是“一”。
根据一般学生的铅笔盒中铅笔数量，通常有四根比较常见。
所以选择B 选项four。
3.There are ____ students in our classroom.A.twentyB.thirtyC.forty答案解析：A。
B 选项thirty 是“三十”；C 选项forty 是“四十”；D 选项fifty 是“五十”。
一般教室中学生数量二十比较符合实际情况。
所以选择A 选项twenty。
4.My sister is ____ years old.A.eightB.nineC.tenD.eleven答案解析：C。
A 选项eight 是“八”；B 选项nine 是“九”；D 选项eleven 是“十一”。
根据一般小学生的年龄，十岁比较合理。
所以选择C 选项ten。
5.I have ____ apples.A.twoB.threeC.fourD.five答案解析：B。
A 选项two 是“二”；C 选项four 是“四”；D 选项five 是“五”。
根据通常情况下拥有苹果的数量，三个比较合适。
所以选择B 选项three。
6.There are ____ days in a week.A.fiveC.sevenD.eight答案解析：C。
小升初数学应用题英语阅读理解20题
小升初数学应用题英语阅读理解20题1<背景文章>In a shopping mall, there are various items on sale. Tom wants to buy a shirt and a pair of pants. The shirt costs 30 dollars and the pants cost 45 dollars. He gives the cashier 100 dollars. Now let's think about how much change he should get.There is also a rectangular garden in Tom's house. The length of the garden is 10 meters and the width is 8 meters. We can calculate the area of the garden. It is important to know the formula for calculating the area of a rectangle, which is length times width.When it comes to motion problems, for example, a car travels at a speed of 60 kilometers per hour. It travels for 3 hours. We can figure out the distance it has traveled by using the formula distance = speed × time.1. <问题1>Tom buys a shirt for 30 dollars and pants for 45 dollars and gives 100 dollars to the cashier. How much change should he get?A. 20 dollarsB. 25 dollarsC. 30 dollarsD. 35 dollars答案：B。
小升初数学思维训练英语阅读理解20题
小升初数学思维训练英语阅读理解20题1<背景文章>There is a fun math puzzle. Tom has some apples. He gives half of his apples to his friend Lily. Then Lily gives one-third of the apples she now has to her brother Ben. If Tom started with 12 apples, how many apples does Lily have after Tom gives her some?First, we know Tom has 12 apples. He gives half of them to Lily. Half of 12 is 6. So Lily now has 6 apples.Now, let's find out how many apples Lily gives to Ben. One-third of 6 is 2. So Lily gives 2 apples to Ben.After giving some apples to Ben, Lily still has 6 - 2 = 4 apples.1. How many apples does Tom start with?A. 10B. 12C. 14D. 16答案：B。
解析：文章中明确提到Tom started with 12 apples.2. How many apples does Tom give to Lily?A. 4B. 6C. 8D. 10答案：B。
解析：Half of 12 is 6, so Tom gives 6 apples to Lily.3. One-third of the apples Lily has is given to Ben. How many apples does Lily give to Ben?A. 1B. 2C. 3D. 4答案：B。
小升初数学趣题英语阅读理解20题
小升初数学趣题英语阅读理解20题1<背景文章>There is an interesting math puzzle. One day, Tom has a basket of apples. He wants to share these apples with his friends. There are 20 apples in total. If he gives 4 apples to each friend, how many friends can he share with?Now let's think about another situation. If there are 30 apples and Tom wants to put them into bags. Each bag can hold 5 apples. How many bags does he need?In a math class, the teacher asked a question. There are 12 students in the class. If each student gets 3 pencils, how many pencils are needed in total?___ pencils are needed.The students also had a problem to solve. There are 16 candies. If they are divided equally among 4 children, how many candies will each child get? Each child will get ___ candies.Another question is about shapes. There are 8 triangles and some squares. The total number of shapes is 15. How many squares are there? There are ___ squares.>1. How many friends can Tom share his 20 apples with if he gives 4 apples to each friend?B.5C.6D.7答案：B。
小升初英语数字运算练习题50题(带答案)
小升初英语数字运算练习题50题(带答案)1.There are 3 apples on the table. And then Tom puts 2 more apples on the table. How many apples are there on the table now?A.4B.5C.6答案解析：B。
首先分析选项A，3+2=5 而不是4；选项C，3+2=5 也不是6；选项B，3 apples plus 2 apples equals 5 apples. 本题考查了数字的加法表达以及“There be”句型，在英语中“three apples and two apples are five apples”，通过这个句子结构来表达加法运算。
2.Mary has 4 pencils. Her friend gives her 3 pencils. How many pencils does Mary have now?A.6B.7C.8答案解析：B。
选项A，4+3=7 不是6；选项C，4+3=7 不是8；选项B，Mary has four pencils. Her friend gives her three pencils. Four pencils plus three pencils equals seven pencils. 考查了数字的加法表达以及“have”表示“拥有”的用法，“four plus three is seven”这个表达可以帮助理解加法运算。
3.There are 2 books on the shelf. Tom puts 4 more books on the shelf. How many books are there on the shelf now?A.5B.6C.7答案解析：B。
选项A，2+4=6 不是5；选项C，2+4=6 不是7；选项B，There are two books on the shelf. Tom puts four more books on the shelf. Two books plus four books equals six books. 考查了“There be”句型和数字加法表达，“two plus four is six”帮助理解加法运算。
小升初数学应用英语阅读理解25题
小升初数学应用英语阅读理解25题1.There are 5 apples on the table. Tom takes 2 apples. How many apples are left on the table?A.2B.3C.4D.6答案：B。
解析：一开始有5 个苹果，汤姆拿走2 个，5 减2 等于3，所以剩下3 个苹果。
A 选项是汤姆拿走的数量；C 选项计算错误；D 选项是错误的加法结果。
本题涉及减法运算和简单的英语阅读理解。
2.Mary has 3 pencils. John has twice as many pencils as Mary. How many pencils does John have?A.3B.6C.9D.12答案：B。
解析：玛丽有3 支铅笔，约翰的铅笔数是玛丽的两倍，3 乘以2 等于6，所以约翰有6 支铅笔。
A 选项是玛丽的铅笔数；C 选项和D 选项计算错误。
本题涉及乘法运算和英语倍数表达。
3.There are 8 students in a classroom. 4 students go out. Then 2 more students come in. How many students are there in the classroom now?B.4C.6D.10答案：C。
解析：一开始有8 个学生，4 个出去后还剩 4 个，又进来2 个，4 加2 等于6，所以现在有6 个学生。
A 选项错误；B 选项是出去4 个学生后的数量，没有加上进来的2 个；D 选项计算错误。
本题涉及加减法运算和英语阅读理解。
4.A book costs 10 yuan. Tom has 20 yuan. How many books can he buy?A.1B.2C.3D.4答案：B。
解析：一本书10 元，汤姆有20 元，20 除以10 等于2，所以他能买2 本书。