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(jié)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. usuallyB. seldomC. neverD. 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
學(xué)而思名師點(diǎn)評(píng)
本篇著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(duì)它們的認(rèn)識(shí)過程。這是一篇說明文，文章淺顯易懂。
答案簡(jiǎn)析
A�？諝馔ǔ１豢闯墒枪诘厍蛲獗淼奶鹤�。
B。
B。more than固定短語“不僅僅”。
D。根據(jù)常識(shí)，洞穴當(dāng)然在地球的深處。
C。固定短語be mixed with。
A。與下文中above的意思相反，即在地表之下。
B。人們誤以為，事實(shí)并非如此。
A。他們“稱之為……”told ， said 都不準(zhǔn)確，而name的時(shí)態(tài)不對(duì)。
C。這里的as有“隨著”的意思，相當(dāng)于when 。
C。此處decided意為“得出結(jié)論”。believe很具有迷惑性，但其時(shí)態(tài)不對(duì)。特別要當(dāng)心呀。
B。最終得出結(jié)論。另外三個(gè)選擇都很顯然不對(duì)。
D。 either用于否定句，“也不”的意思。
C。 無論是語法結(jié)構(gòu)還是意思只有In fact對(duì)。
D。 盡管它們不是元素，但他們是人類環(huán)境的三個(gè)主要部分。
D。 你會(huì)對(duì)它們了解得更多。
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