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【单选题】

The invisible rays of the ______ beyond the violet end are called the ultraviolet rays.
A．speculation

B．spectrum
C．sleet
D．range
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根据网考网移动考试中心的统计，该试题：

20%的考友选择了A选项

73%的考友选择了B选项

2%的考友选择了C选项

5%的考友选择了D选项

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