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阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答题卡的相应位置上。 If the population of the Ea...
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阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答题卡的相应位置上。
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 21st century, if present trends continue, we2._________(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. But4.______ of the other planets in our solar system are capable of supporting life at present. One possible solution5.______ 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 Earth9. .The difficulty is that Venus is much hotter than the Earth. 10.________, there is only a tiny amount of water there.
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