The invisible rays of the ______beyond the violet end are called the ultraviolet rays.

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问题 The invisible rays of the ______beyond the violet end are called the ultraviolet rays.

选项 A、speculation
B、spectrum
C、sleet
D、range

答案B

解析 B项spectrum“光谱”符合题意。其他三项都与题意不符:speculation猜测,投机;sleet冰雨;range范围。
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