历年英语四级考试的阅读理解部分7_大学英语阅读

　　51. According to the first paragraph, the atmosphere is essential to man in that ______.

　　A) it protects him against the harmful rays from space

　　B) it provides sufficient light for plant growth

　　C) it supplies the heat necessary for human survival

　　D) it screens off the falling meteors

　　52. We know from the passage that ________.

　　A) exposure to even tiny amounts of radiation is fatal

　　B) the effect of exposure to radiation is slow in coming

　　C) radiation is avoidable in space exploration

　　D) astronauts in spacesuits neednt worry about radiation damage

　　53. The harm radiation has done to the Apollo crew members _______.

　　A) is insignificant

　　B)seems overestimated

　　C) is enormous

　　D) remains unknown

　　54. It can be inferred from the passage that ________.

　　A) the Apollo mission was very successful

　　B) protection from space radiation is no easy job

　　C) astronauts will have deformed children or grandchildren

　　D) radiation is not a threat to well-protected space explorers

　　55. The best title for this passage would be _______.

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