3. liquid expand contract substance mixture oxygen electricity stage conclusion aim

4. reaction electrical equipment react potassium sodium calcium magnesium aluminium zink

5. partial copper oxide rust boil ordinary steam float form dissolve

6. balance crucible tongs flame facility lecture department astonished

8. 得出结论 瞄准 沸腾的水 许多设备 作为固体存在 加热金属 draw a conclusion aim at sth. boiling water many facilities much equipment exist as a solid heat a metal

9. －的一种混合物 电力设备 与－－起反应 按顺序进行排列 在顶部 在底部 a mixture of electrical equipment react with put sth. in order at the top at the bottom

10. 从－中学习 往－－里加－－ 过去常常 最新的设备 一学期四次 在－－的领域 learn from add… to… used to do sth. the latest equipment four times a term in the area of

11. 作出真正的发现 一流的科学家 在过去的 20 年里 为－感到骄傲 应当；理应 或者－或者 make real discoveries first– class scientist in the last 20 years be proud of be supposed to either … or

12. According to the text, fill in the blanks. Different metals have different___. When we use metals,it is __ to know they___with different ___. The reaction of metals with these substances can be put in ___. From the ___,we can find potassium reacts___ with oxygen and water while ___doesn’t react with water. When we ___calcium in oxygen, it burns to ___an oxide. uses important how react substances order table most copper heat form ∨

13. as 1. adv. 同样，一样 Tom runs fast, but I run just as fast. 2. conj. ① 当－－－时 I read the letter as I walked along the river. ② 由于；鉴于 As he wasn’t ready in time, we went without him.

14. ③ 像－－一样 She doesn’t sing as (so) well as her sister. ④ 按照；如同 I have changed it as you suggested. Do as I do. ⑤ 虽然，尽管 Tired as they were, they walked on. 3. prep. 作为；如同 He worked as a teacher. Why is he dressed as a woman.

15. 4. pron. Such … as \ the same …as I never heard such stories as he told. My hometown is no longer the same as it was. as is well known as for 至于；就－－而言 As for me, I have nothing to complain of. as if = as though I remember the whole thing, as if it happened yesterday

16. Correct the mistakes: 1.The income of his family is two times that of hers. 2. Life today is much better than it in the past. 3. Electrical lamps are now used to give us light at night. 4.Our react to a joke is to laugh. ____________ twice \ that __________ electric _____ reaction

17. 5.A lot of equipment have been brought in from Japan. 6. The building to be built last year is a hospital. 7. I thought my past days when I saw the old photos. 8.I’d like to buy the same bicycle that you have. 9.It’s sure the earth is round. \ has \ \ ˇ of \ as \ certain

18. 10.There used to have a lot of wild animals living here. 11.It’s six o’clock now. He is suppose to be at home. 12.Does Mr. Smith get used to live in the countryside. 13.In the past few years, a lot of new buildings had been built. _____ be _________ supposed ____ living ____ have

19. Choose the best answers. 1.------Are you feeling ___? ------yes, I’m fine now. A. any well B. any better C. quite good D. quite better B

20. 2.___ is a good habit to put everything ___ order after an experiment. A. This ;in B. It; in C. That; with D. It;with B 3.Gold is ___most valuable of all metals. A. the much B. very C. far D. by the far 4.This car is ___cheaper than the one they bought last year. A. more B. less C. no D. very D C

21. 4.How wonderful she sings! I have never heard____. A.the better voice B. a good voice C. the best voice D. a better voice 5.___the temperature is, ___water turns into steam. A.The higher; the fast B. Higher; faster C. The more higher; the faster D. The higher; the faster D D

22. 6.As time went on, he became___. A. more impatient and more impatient B. more and more impatient C. more and more impatiently D. impatienter and impatienter 7. Canada is larger than___ country in Asia. A. Any B. any other C. other D. another B A