新概念英语青少版 2b Unit 24(课堂PPT)

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Lesson 47
4. I looked it up yesterday. look up---查阅/找
5.They’re both long rivers. both= not only one, but also the other(不止这一个，而且另一个)，分配词，修饰
（双）主语。“两者都.....” 放在be和助动词后面，主要动词前面 6.It isn’t obvious, is it?
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Lesson 47
try out (on) e.g.We can try it out on this mouse.
try on 试穿(衣服等)；试戴；试用 try n. have a try
v. try to do sth. try doing sth. try one’s best to do sth.
直接加-er, -est. tall taller tallest strong long 以e结尾加-r, -st brave braver bravest nice large
辅音字母+y结尾，y→i加-er, -est pretty prettier prettiest untidy dirty happy
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Lesson 47
trick question
trick These children loved playing tricks on their teacher. He played some clever magic tricks.
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Lesson 47
square mile e.g.The area of China is 9,600,000 square miles.
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Lesson 47
than e.g. Tom is taller than Tim.
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Lesson 47
continent e.g.Australia is a large continent. There are seven continents in the world.
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Lesson 47
( )3. It is said that it is ___ today than yesterday. Shall we go swim ming this afternoon? A. the hottest B. hot C. hottest D. hotter
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Pattern practice
1. A: Bob’s a tall boy. B: Yes, but John’s taller than Bob.
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Pattern practice
2.A: Bob, John and Dan are all tall. B: Yes, but Dan’s the tallest of the three.
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Lesson 47
3.the Nile/the Amazon---河流、大海、大洋的专有名词前用定冠词，这些专 有名词中的river, sea和ocean可以省略
如：the (River) Thames, the Mediterranean (Sea), the Pacific (Ocean)
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Lesson 47
2. Which is the highest mountain in the British Isles? 当把某人或某物与同类别的一个以上的人或物相比较时，我们使用最高级the highest mountain (the uniquely high mountain 唯一的高的山) in+单数可数名词/不可数名词（表全部的范围） British Isles---地理名词，包括不列颠、爱尔兰和马恩岛在内的政治实体
answer
n. 回答，答复
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Lesson 47
quiz e.g.We will have a quiz tomorrow
morning.
examination正式的“考试”，如期末考 试、入学考试等。 exam 是examination的缩写，常用于口 语，多为学生使用。 test为“小考 ” quiz 为“测验”,特指事先无准备，随时 进行的测验，也可指（广播节目中的） 一般知识测验、问答比赛、猜谜等
No, it’s a good question. 否定形式的陈述句+肯定形式的反意疑问句，期望得到肯定的回 答。
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Lesson 47
7.Australia’s a continent, and it has only six people to the square mile.
不定冠词a表示类别 表示比例的介词全部用to e.g. 1:2---one to two the square mile---定冠词强调整体中具代表性的一部分.
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Lesson 48
New words and expressions In fact adv.(viewpoint)(focus)实际上 competition n.比赛 brave adj.勇敢的 uncle n. 叔叔，伯父 untidy adj. 不整洁的 person n.人
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Grammar----形容词和副词变形
重读闭音节，且只有一个辅音字母结尾时，双写最后一辅音字母加-er, -est hot hotter hottest big thin red wet fat sad
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形容词和副词的比较级和最高级 词变形
多音节在词前直接加more/most exciting more exciting most exciting interesting friendly excited
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Lesson 47
population The world population is increasing faster and faster. About seventy percent of the population in China are farmers. India has a large population. Singapore has a small population. What is the population of Canada?
Uint 24
A quiz
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Lesson 47
New words and expressions:
quiz n. 问答比赛，小测试
try out (on) v.+adv.
particle
(transitive) (+prep. + object)试一试
than conj. (comparison)比
Tom is the taller of the two.
句中常带有表示比较范围的介词 in…或of…
e.g. Yao Ming is the tallest of the players.
注：形容词最高级前必须加the
e.g. Tom is the tallest in his class.
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练习
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Lesson 47
obviously obvious adj. e.g.Obviously, she needs help. It isn't obvious,is it?
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Lesson 47
answer n. eg. Do you know the answer to this question? Do you answer the question?
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Lesson 48
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Homework
测试卷
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low e.g. I find a low-fat yoghurt. low income a low voice
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Lesson 47
population density 人口密度 eg. The density of population in this city is very high. Which continent has low population density?
continent n. 大陆，洲
low adj. 低的
population density compound n. 人 口密度
trick question compound n. 陷阱问 题(看似容易其实困难的问题) square mile compound n. 平方英 里
obviously adv. (viewpoint) (manner) 明显的
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Pattern practice
4. (Not with pictures R and S) A: Who’s the tallest boy in our class? B: Dan is. Dan’s the tallest.
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Pattern practice
5. A: John’s taller than Bob. B: You’re right. But Dan’s taller than John. In fact, Dan’s the tallest boy in our class.
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形容词和副词的比较级和最高级
比较级：用于两者之间进行比较
最高级：表示三者或三者以上的比较，意为 “最…”
......动词+比较级+than....... (...比...更...) ......the+比较级+of the two (两者中，
比较...的那个)
e.g. Tom is taller than Jim.
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Pattern practice
3.A: Who’s taller---Bob or John? /Which is hotter---June or July?