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

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

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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
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