【題目】語法填空。

If the population of the Earth keeps on increasing at its present rate, there will eventually not be enough resources 【1】(leave) to support life on the planet. By the middle of the 26st century, if present trends continue, we 【2】（use）up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on the earth will make 【3】necessary for us to look for open space somewhere else. But 【4】 of the other planets in our solar system are capable of supporting life at present. One possible solution 【5】 the problem, 【6】, has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes 【7】 before the Earth’s resources are 【8】(complete) exhausted it will be possible to change the atmosphere of Venus and therefore create a new world almost as large as the Earth【9】.The difficulty is that Venus is much hotter than the Earth. 【10】, there is only a tiny amount of water there.

【答案】

【1】left

【2】will have used

【3】it

【4】none

【5】to

【6】however

【7】that

【8】completely

【9】itself

【10】Besides/Moreover/Furthermore.

【解析】

試題分析：文章大意：如果地球上的人口仍以當(dāng)前的增長率增長的話，最終地球上將沒有足夠的資源供給生命生長。面對人口急劇地增長，資源日益地短缺的困境，可能的途徑就是其他星球?qū)ふ铱臻g，比如金星。

【1】left.考查非謂語動詞，leave與resources是動賓關(guān)系，應(yīng)用leave的過去分詞形式left做后置定語。

【2】will have used.考查將來完成時(shí)。由時(shí)間狀語by the middle of the 21st century可知要用將來完成時(shí)態(tài)。

【3】it.考查形式賓語及固定搭配。make it +adj “使…處于…狀態(tài)”。

【4】none.考查代詞及固定搭配。But表轉(zhuǎn)折，到其他地方找開放空間是重要，但是目前太陽系中除了地球沒有其他星球可以支持生命。 none of“沒有一個(gè)”

【5】to.考查固定搭配。the solution to“…的解決辦法”，注意to在這是介詞。

【6】however.考查連詞。前一句說沒有其他星球可以支持生命，結(jié)合后文知金星上還是有供給生命的水分。故這里缺少表示轉(zhuǎn)折的連詞。however表轉(zhuǎn)折。

【7】that.考查賓語從句的引導(dǎo)詞。該句是賓語從句，其引導(dǎo)詞為that。

【8】completely.考查副詞。completely修飾形容詞exhausted,表示地球資源完全枯竭。

【9】itself.考查反身代詞。地球本身 Earth itself.

【10】Besides/Moreover/Furthermore.考查副詞。.由語境知這里缺少個(gè)并列詞，只有副詞可單獨(dú)運(yùn)用，bessides,moreover,furthermore“而且，此外”，表并列關(guān)系。

考點(diǎn):考查對語法掌握和篇章理解能力

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