The water and the land are thought part of the earth surface (表面). The air is 1 thought a kind of blanket (毯子) 2 the earth. But it is 3 than that. Maybe you have been in a cave (洞穴) 4 in the earth. Did you think about the air that was in the cave? The land has some air mixed in it. Air is even mixed 5 the water in the sea. These examples show that some air is 6 the earth’s surface as well as above it.

Men once 7 that there were four basic things from which everything else was made. They 8 these things-earth, fire, air and water the four elements (元素). 9 man made more observations, they 10 that fire was not an element. 11 they concluded (得出結論) that land, air and water were not elements, 12 .

13 , there are more than 100 elements from which scientists believe all things are made. 14 land, air and water are not elements, they are three main parts of man’s environment (環(huán)境). You will 15 more about them as you study the earth.

1. A. usually B. seldom C. never D. sometimes

2. A. above B. around C. across D. among

3. A. better B. more C. less D. worse

4. A wide B. high C. long D. deep

5. A. at B. in C. with D. to

6. A. below B. before C. between D. beside

7. A. found B. thought C. knew D. understood

8. A. called B. told C. name D. said

9. A. That B. For C. As D. So

10. A. believe B. planned C. decided D. want

11. A. End B. At last C. Hardly D. Nearly

12. A. too B. neither C. also D. either

13. A. True B. Read C. In fact D. Correctly

14. A. When B. As C. Since D. Though

15. A. exam B. study C. exercise D. know

名師點(diǎn)評

本篇著(zhù)重介紹與人們的生活休戚相關(guān)的地球、水、空氣以及人們對它們的認識過(guò)程。這是一篇說(shuō)明文，文章淺顯易懂。

答案簡(jiǎn)析在下一頁(yè)：

1. A�？諝馔ǔ１豢闯墒枪�在地球外表的毯子。

2. B。

3. B。more than固定短語(yǔ)“不僅僅”。

4. D。根據常識，洞穴當然在地球的深處。

5. C。固定短語(yǔ)be mixed with。

6. A。與下文中above的意思相反，即在地表之下。

7. B。人們誤以為，事實(shí)并非如此。

8. A。他們“稱(chēng)之為……”told , said 都不準確，而name的時(shí)態(tài)不對。

9. C。這里的as有“隨著(zhù)”的意思，相當于when 。

10. C。此處decided意為“得出結論”。believe很具有迷惑性，但其時(shí)態(tài)不對。特別要當心呀。

11. B。最終得出結論。另外三個(gè)選擇都很顯然不對。

12. D。 either用于否定句，“也不”的意思。

13. C。 無(wú)論是語(yǔ)法結構還是意思只有In fact對。 #p#分頁(yè)標題#e#

14. D。 盡管它們不是元素，但他們是人類(lèi)環(huán)境的三個(gè)主要部分。

15. D。 你會(huì )對它們了解得更多。

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