They used radio waves instead of sound waves, since radio waves can penetrate fog and clouds. ( Passage 1)

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问题 They used radio waves instead of sound waves, since radio waves can penetrate fog and clouds. ( Passage 1)

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答案他们是用无线电波而不是声波,因为前者可以穿透云层和雾气。

解析 instead of而不是;since因为,既然,由于;penetrate穿过,刺入,渗人。
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本试题收录于: 英语题库普高专升本分类
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