六级冲刺练习阅读（51）_大学英语阅读

　　21. In the long run, the most difficult problem caused by population growth on earth will probably be the lack of______.

　　A. food B. oil

　　C. space D. resources

　　22. Carl Sagan believes that Venus might be colonized from earth because______.

　　A. it might be possible to change its atmosphere

　　B. its atmosphere is the same as the earths

　　C. there is a good supply of water on Venus

　　D. the days on Venus are long enough

　　23. On Venus there is a lot of______.

　　A. water B. carbon dioxide

　　C. carbon monoxide D. oxygen

　　24. Algae are plants that can______.

　　A. live in very hot temperatures B. live in very cold temperatures

　　C. manufacture oxygen D. all of the above

　　25. Man can eventually land on Venus only when______.

　　A. the algae have done their work B. the atmosphere becomes cooler

　　C. there is oxygen D. it rains there

　　21. C 22. A 23. B 24. D 25. D

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