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【单选题】

The British used radio waves because they ____________.
A.were more exact than sound waves

B.could not be detected
C.could penetrate fog and clouds
D.were easier to use than sound waves
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根据网考网移动考试中心的统计,该试题:

9%的考友选择了A选项

21%的考友选择了B选项

66%的考友选择了C选项

4%的考友选择了D选项

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