Once out of the earth’s gravity, the astronaut is        by the problem of weightlessness.
A．a(chǎn)ffectedB．effected
C．relatedD．offered
A
句意為“一旦擺脫了地球吸引力，宇航員就受到失重問題的影響。”affect vt. 影響，與句意吻合。
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