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1、 Unit 4 Astronomy: the science of the stars I. 預(yù)習(xí)內(nèi)容： 1. 了解宇宙科學(xué)、地球生命的起源，了解萬有引力、黑洞和太空旅行等天文知識，培養(yǎng)學(xué)生對科學(xué)的興趣、激發(fā)學(xué)生探討科學(xué)的熱情。 2. 掌握本單元的詞匯和習(xí)慣用法。 3. 學(xué)會在日常交際中正確運用指示語。 4. 掌握名詞性從句中主語從句的用法。 II.知識點 2. However, according to a widely accepted theory, the universe began with a “Big Bang’’ that threw matter in

2、 all directions. In all direction = in every direction 向四面八方 In one direction 朝同一個方向 In the direction of 朝某個方向 Under the direction of 在某人的指導(dǎo)下 According to the directions按照說明書 3. what’s more important is that as the earth cooled down, water began to appear on its surface. As 作連詞，引導(dǎo)了時間狀

3、語從句。還可以引導(dǎo)時間、原因、方式、讓步等狀語從句。 1） 當(dāng)……時候 相當(dāng)與when/while，引導(dǎo)時間狀語從句。但as較強調(diào)主句從句中的動作同時發(fā)生。 2） 隨著 As time went on, many changes took place in my village. 3） 因為，由于 We don’t know what to do as we were just visiting there. 4） 按照，如同 方式狀語從句 You ought to do as Paul tells you. 5） 盡管，雖然 讓步狀語從句 引導(dǎo)的讓步狀語從句中，要用倒裝，即

4、把作表語的名詞或形容詞及作狀語的副詞放在句首（名詞前不能加冠詞）；有時，把謂語部分的動詞原形提前。 Child as he is, he knows a lot. Hard as he worked, he didn’t pass the exam. Try as you may, you won’t succeed. 5. Later when the plants grew into forests, reptiles appeared for the first time. For the first time 作狀語，the first time 作連詞引導(dǎo)時間狀語從句。類似

5、用法還有 every time /next time /each time ; the moment / the minute ; the first time / second …last time; immediately/ directly; imstantly等 Eg: Each time I saw him, I thought of his poor brother. He took off his coat the moment he arrived home. 6. Why they suddenly disappered still remaines a m

6、ystery. remain: ⑴ vi. 留下；剩下 ⑵ link.v +n. /adj. / to be done 依然不變，繼續(xù)，保持 e.g. Where he has gone remains a mystery. The door remained locked. It sounds like a good idea,but it remains to be seen whether it will succed. The fact remains to be proved. remaining adj. 剩下的，作前置定語 ，

7、用法同the rest of ; left 作“剩下的”講時。作后 置定語 e.g. He bought a gift for his daughter ,using the remaining money/ the rest of (his ) money/ the money left. 7. We shall feel its gravity pulling us, but it will not be as strong a pull as the earth’s. ⑴ as + adj. +a/an + n.+ as 和...

8、...一樣 We have as big a house as our neighbour’s. ⑵ as +adj./adv.+ as He drove as fast as he could. ⑶ as + much +a/an+n.+as To hold the Olympic Games is just as much a competition among countries as to win an Olympic medal. It is generally believed that teachin

9、gt is as much an art as it is a science. ⑷ as + much/many....+as Return as many books/ much money as you borrowed. 8. break out （戰(zhàn)爭，火災(zāi)等）爆發(fā)；（疾病）突然發(fā)生 break up 分解/破裂；解散/體；損害/粉碎 break down （機器）出故障；（談判）失??；（身體，精神）跨掉 break in 插話/打斷；強行進行 break away from 脫離/擺脫 break off 突然結(jié)束/中斷 break one’s word/promise 食言 2