18.How will our continuously growing population affect our way of life,our environment,even our planet?No matter how you look at it,we will face (41)anextremely serious problem.By the middle of the 21st century,we (42)will have used(use) up all the oil that drives our cars if at the rate we're going.Even if scientists develop some new (43)ways(way)of feeding the human race,the crowded conditions on the earth will make (44)Itnecessary for us to look for open space somewhere else.But none of the planets in our solar system are able (45)to support(support) life at present.One possible solution (46)tothe problem,however,has recently been suggested by an American scientist,Professor Carl Sagan.His idea is (47)thatbefore the earth's resources are almost exhausted,it will be (48)totally(total)possible to change the atmosphere of Venus(金星)and so create a new world almost as large as earth itself.
However,(49)beforehis idea is turned into reality,humans have a long way to go.On the one hand,Venus is much (50)hotter(hot)than the earth; on the other hand,there is only a tiny amount of water there.

分析 考查用法填空,文章大意:我們不斷增長(zhǎng)的人口將如何影響我們的生活方式,我們的環(huán)境,甚至我們的星球?有什么解決辦法?

解答 41.a(chǎn)n,考查冠詞,泛指一個(gè)嚴(yán)重問題,extremely是以元音開頭的,所以用an.
42.will have used,考查將來完成時(shí)態(tài).根據(jù)時(shí)間狀語By the middle of the 21st century,應(yīng)該用將來完成時(shí)態(tài).
43.ways,考查名詞,way可數(shù)名詞,前面有some,所以用復(fù)數(shù).
44.It,不定式做賓語放在后面,前面需要用it坐形式賓語.
45.to support,考查不定式,be able to do,所以用不定式.
46.to,考查介詞,"解決問題的方法"用"the solution to the problem",所以用to.
47.that,考查連詞,that引導(dǎo)表語從句,布做成分,沒有含義.
48.totally,修飾形容詞應(yīng)該用副詞.
49.before,考查連詞,根據(jù)句意"在她的想法變成現(xiàn)實(shí)之前,人類還有很長(zhǎng)的路要走",用before.
50.hotter,后面有than,前面需要用比較級(jí).

點(diǎn)評(píng) 本題主要考查了用單詞或短語的適當(dāng)形式填空.做本題的關(guān)鍵是在理解短文的基礎(chǔ)上,靈活運(yùn)用所學(xué)的基礎(chǔ)知識(shí).本題考到的知識(shí)點(diǎn)有:固定的短語,詞類的轉(zhuǎn)換,名詞的復(fù)數(shù)形式,副詞以及祈使句的用法等.因此,這就需要在平時(shí)的學(xué)習(xí)中,牢固掌握各語言點(diǎn)及一些語法知識(shí).

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