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

游客2025-05-04 47

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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