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  3. According to the first paragraph, the atmosphere is essential to man in that ______. The best title for this passage would be _

According to the first paragraph, the atmosphere is essential to man in that ______. The best title for this passage would be _

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问题 According to the first paragraph, the atmosphere is essential to man in that ______.
The best title for this passage would be ______.
选项 A、The Atmosphere and Our Environment
B、Research on Radiation
C、Effects of Space Radiation
D、Importance of Protection Against Radiation
答案C
解析 本题为主旨归纳题。第一段论述了大气对地球环境的保护主要是它起着一个保护伞的作用，有它的存在地球就避免了来自太阳辐射的危害。第二段紧接着论述了人体对辐射的承载度和辐射对人的危害的潜伏性和程度。因此，本文的主要论述对象是太空辐射对人的影响，而不是防护辐射的重要性或大气和我们的环境。
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