2. 外语
  3. Recently, great advances have been made in the study of Venus surface by the use of radar waves to______the dense cloud layer.

Recently, great advances have been made in the study of Venus surface by the use of radar waves to______the dense cloud layer.

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问题 Recently, great advances have been made in the study of Venus surface by the use of radar waves to______the dense cloud layer.
选项 A、persecute
B、pierce
C、penetrate
D、plunge
答案C
解析 penetrate"穿过，渗人"；pierce"刺破，刺穿"；persecute"迫害"；plunge"使(某物)投入，陷入"。
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