2. 职称英语
  3. The invisible rays of the ______beyond the violet end are called the ultraviolet

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

游客2025-05-04  8
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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