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  3. According to the first paragraph, the atmosphere is essential to man in that ______. The harm radiation has done to the Apollo

According to the first paragraph, the atmosphere is essential to man in that ______. The harm radiation has done to the Apollo

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问题 According to the first paragraph, the atmosphere is essential to man in that ______.
The harm radiation has done to the Apollo crew members ______.
选项 A、is insignificant
B、seems overestimated
C、is enormous
D、remains unknown
答案D
解析 本题为细节判断题。在第二段中作者指出：“So far，no dangerous amounts of radiation have been reported…”据此，我们可知辐射对阿波罗飞船船员的危害至今还不得而知。
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