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【简答题】
紫外线消毒的最有效范围是UV—C波段，波长为200—280nm的紫外线正好与微生物失活频谱曲线相重合，尤其是波长为（）nm的紫外线，是微生物失活的频谱曲线的峰值。
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参考解析：
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【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, ...
A.
from
B.
than
C.
as
D.
away