Cosmic rays of various kinds come through the air from outer space, but enormous

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问题 Cosmic rays of various kinds come through the air from outer space, but enormous quantities of radiation from the sun are ______ off.

选项 A、avoided
B、excluded
C、screened
D、separated

答案 C

解析 C项screen off“隔开”。A项avoid“避免”；B项exclude“排除”；D项separate“使隔开”，其后不跟off。译文：宇宙中的各种光线从外层空间透过大气层，但是太阳的大量辐射能被大气层隔开。根据题意，应选C项。

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