When the algae have done their work, the atmosphere will become cooler, but before man can set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.

　　1.In the long run, the most difficult problem caused by population growth on the earth will probably be the lack of ______.

　　A. oil

　　B. food

　　C. resources

　　D. space　

　　2.Carl Sagan believes that Venus might be a living place because _____

　　A. the days on Venus are long enough

　　B. it might be possible to change its atmosphere

　　C. there is a good supply of water on Venus

　　D. its atmosphere is the same as the earth's

　　3.Algae are plants that can____.

　　A. live in very hot temperature

　　　 B. live in very cold temperature

　　C. produce oxygen

　　D. all of the above

　　4. Man can land on Venus only when_______.

　　A. it rains there

　　B. there is oxygen

　　C. the atmosphere becomes cooler

　　D. the algae have done their work

　　参考答案1—4、DBDA

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