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  3. According to the first paragraph, the atmosphere is essential to man in that ______. We know from the passage that ______.

According to the first paragraph, the atmosphere is essential to man in that ______. We know from the passage that ______.

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问题 According to the first paragraph, the atmosphere is essential to man in that ______.
We know from the passage that ______.
选项 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 needn’t worry about radiation damage
答案B
解析 本题为细节推理题。在第二段中，作者指出人们无法弄清辐射的危害，有时候一直到第二代或第三代出生的时候才能发现。因此，我们可以推理得知辐射的影响很迟才能出现。
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