Recently, great advances have been made in the study of Mars’ 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 Mars’ surface by the use of radar waves to ______ the dense cloud layer.

选项 A、hover
B、pierce
C、penetrate
D、plunge

答案C

解析 语义连贯题。雷达应该是穿过云层,答案选[C]penetrate“透入,渗入”。[A]hover“盘旋,翱翔”,指飞行物在空中盘旋或者飞行;[B]pierce“刺穿,刺透”;[D]plunge“使投入,使插入”。
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