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
B [细节理解题。根据第二段第一句...it will be possible to change the atmosphere of Venus and so create a new world almost as large as the earth itself.可知,金星有可能改变它的大气继而成为适宜人类生存的地方。故选B项。]
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
D [细节理解题。根据第三段第一句可知,海藻有机体可以在极热和极冷的温度下生存,同时还能产生氧气。故选D项。]
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
A [推理判断题。在文章最后一段中提到,在人类踏足金星之前需要氧气去制造雨水,然后又提到雨水最后会降落到金星上使得气温下降,这样人类就可以居住了。由此可以推测A项正确。]
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