2. 1. What it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun. 1._________________ （使大家吃惊的是） is that he didn’t come to the meeting. What surprised everybody 2. ________________ （他所做的） added to our difficulty. What he did _____ we can’t get seems better than ____ we have. A.What; what B. What; that C. That; that D. That;what _____ made the school proud was _____ more than 90% of the students had been admitted to key universities. A.What;because B. What;that;C. That;what D.That;because A B

3. 2.The problem was that the earth became violent because it was not clear whether the solid shape was to last or not. 问题是地球开始变得激烈动荡，不知道这个固体形状是否会继 续下去。 n. 固体 solid, liquid, gas adj. 固体的；实心的, 无空隙的；结实的，坚固的 solid fuels solid food a solid sphere solid furniture a man of solid build 1) Matter has three states: solid, liquid and gas. 2) When water freezes, it becomes solid and we call it ice.

4. 3.It exploded loudly with fire and rock, which were in time to produce the water vapour, … 1). （使某物）炸开，爆炸 2). （指感情）激发； 3). （指人口）突然或迅速增加 The firework exploded in his hand and he was hurt seriously. I was frightened when she exploded into loud laughter. Now it is not easy to find jobs with the exploding population. explosion n. 爆炸（声） explosive adj. 爆炸性的，易爆炸的 n. 炸药，爆炸物

5. in time sooner or later 迟早 not late 及时，不迟 1) I’ll see him in time. 2) She will be back in time to prepare dinner. 4. As the earth cooled down, water began to appear on its surface. 随着地球的冷却, 地球的表面就开始出现了水。 v. （使）变冷；冷静下来 1) Let’s sit in the shade and get cool. 2) I knew I had to keep cool. 3) His play received a cool response from the public. cool adj. 凉快；冷静；冷淡

6. 4) The rain has cooled the air. 5) Let your soup cool a little before you drink it. 6) A heated argument can be settled better if both sides cool down first. 7) I tried to cool her down but she was still very angry when she left. 5. Nobody knew that it was going to be different from other planets going round the sun. be very / much / quite / entirely / totally different from 与 … 不同 City life is quite different from country life. 1 ）城市生活和农村生活很不同。 2 ）他们的品位和我不同。 Their tastes are different from mine.

7. There are differences between…and… … 与 … 之间有不同之处. tell…from… 把 … 与 … 区分开来 the same as… 与 … 一样 be similar to 与 … 相似 6. It allows the earth to dissolve harmful gases, which… be harmful to 对 … 有害 do harm to sb. = do sb. harm 伤害某人，对某人有害处 1) Pollution is especially harmful to animals. 2) Smoking will do you a lot of harm.

8. 7. That made it possible for life to begin to develop. it 作形式宾语，其真正的宾语可以是不定式，动名词和从句。 1.The foreign Minister said, “_____ our hope that the two sides will work towards peace. ”(2004BJ) A. This is B. There is C. That is D. It is 2. I like ____ in the autumn when the weather is clear and bright. (NMET2004) A. this B. that C. it D. one 3. Why don’t you bring ___ to his attention that you are too busy to do it? A. this B. that C. what D. it D C D

9. 4. Why? I have nothing to confess. ____ you want me to say?(2004SH) A. What is it that B. What it is that C. How is it that D. How it is that 5. Was it at the school ____ was named after a hero ______ he spent his childhood? A. which ; that B. where; where C. that; where D. which; where A A

10. 8. They multiplied and filled the first oceans and seas with oxygen. multiply ( 数目上 ) 增加，增多；乘；（使）繁殖 1) Our problems have multiplied since last year. 2) 2 and 5 multiply to make 10. 4) The plants here multiply rapidly. 9. This encouraged the development of early shellfish and all sorts of fish. development (1)[U] 成长, 发育；发展 ( 过程 ) ；扩展 The development of this industry will take several years. 这项工业的发展要经过几年的时间。 (2)[C] 开发区, 新社区 a new housing development 新建住宅区 (3) [C] 进化, 进展；新情况, 新闻 What are the latest developments? The use of computers in teaching is a recent development. 教学上使用计算机是新近才有的事. 3) 6 multiplied by 5 is 30.= Multiply 6 by 5 to make 30.

11. 10. Many millions of years later the first green plants began to appear on land. late adj. 迟到的，晚的；前任的；以前的；已故的 later adv. 后来，较晚时候, 过后 adj. late 的比较级 ( 更迟的, 更后的 ) latest adj. 最新的 lately adv. =recently 近来 1) Mr. Zhu Rongji is the late Prime Minister of China. 3) She said she would ring you later this morning. 5) It’s only lately that she has been well enough to go out. 2) He is often late for school. 4) Have you heard about the latest news? 11. When the plants grew into forests, reptiles appeared for the first time. 生长成为, 渐渐成为或变得 … （不用于被动语态）

12. She is growing into a beautiful young woman. 她渐渐出落成一个美丽的姑娘。 12. They produced young generally by laying eggs. It’s generally believed that… 一般认为 … generally speaking 一般而言，概括来说 1) It’s generally believed that girls work harder than boys do. 2) Generally speaking, women cry more easily than men. 动词过去式过去分词现在分词意义 lie lay lainlying 躺，位于 lielied lying 撒谎 laylaid laying 搁，放，下 蛋

13. 13. Small clever animals, now with hands and feet, appeared and spread all over the earth. vi. 散布, 传播，蔓延, 伸展，扩展 vt. 铺开，摊开 1) The news spread through the school very quickly. 2) There’s a desert spreading for hundreds of miles. The naughty boy ___ to me that the hen that ___ there just now had___ two eggs the day before. A. laid; laid; laid B. laid; lay; lain C. lied; laid; lain D. lied; lay; laid D 3) He spread out his arms to welcome us. 4) I spread a new cloth on the table.

14. 14. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. 阻止某人做某事 : prevent sb. (from) doing sth. stop sb. (from) doing sth. keep sb. from doing sth. 1) We must prevent them from making trouble. 2) You should prevent the child from injuring himself. If nothing prevents, … 如果没有什么阻碍的话, …

15. 15. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. depend on sb. / sth. sb. to do sth. sb. doing sth. sb. /sth. for sth. 相信，信赖, 依靠, 依赖, 视 … 而定，取决于 1) When you are in a strange place you’d better depend on the map. 2) You can’t depend on others to help you. 3) All living things depend on the sun for their growth. 4) He depends on his pen for his living. wh-

16. 5) You can depend on him. He’ll lead you there. 6) Success depends on your own hard work. 7) Our success depends on whether everyone works hard. depend on it 没问题，请放心（句末或句首） That /It (all) depends. 那得看情况而定 1) Depend on it, you’ll succeed. 2) He may support me, but it depends. Tell him what you want to say; he ’ s a man to __. A. count B. believe C. trust D. depend 解析 : 相信 / 信赖某人 : count on sb. believe in sb. depend on sb. trust (in) sb. C

17. Word study: Translate the following into English 1. 把 …… 当作 2. 太阳系 3. 总有一天；及时 4. 一般地说来 5. 信赖；取决于 6. 目前 7. 做出选择 8. 天文学 9. 氧 think of …as solar system in time generally speaking depend on at present make choices astronomy oxygen

18. Reading comprehension: Put the following sentences into Chinese: 1.What it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun. 随后它会变成什么曾经是一个谜，直到最后这 团尘埃开始慢慢地合成一个环绕太阳运转的球 状物。 2. The problem was that the earth became violent because it was not clear whether the solid shape was to last or not. 问题是地球（开始）变得激烈动荡，不知道这 个固体形状是否会继续存在下去。

19. Reading comprehension: 3. It allowed the earth to dissolve harmful gases, which had become part of the earth’s atmosphere, into the oceans and seas. 它使得地球得以把曾经存在于大气层中的有害气 体，溶解在海洋里。 4. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. 在未来的千百万年中，生命能否在地球上延续将 取决于这个问题能否得到解决。

20. make watch wonder be cool multiply begin exist explode Where do we come from? How did the universe __________ ? When we _______ the stars through the telescope, we _________ why the universe ________. After the “Big Bang”,the earth ______ just a cloud of energetic dust. Somehow it _________ loudly with fire and rock, which ______ the earth’s atmosphere. As the earth _______ down water _______ to appear on its surface, which was important for the beginning of life. Then living things __________ on the earth. begin watch wonder exists was exploded made cooled began multiplied