Recently, great advances have been made in the study of Mars’ surface by the use

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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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[originaltext]Recentlyafive-yearstudywasconductedbytheCenterforC