2. 外语
  3. The invisible rays of the ______ beyond the violet end are called the ultraviolet rays.

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

admin2012-10-23  4
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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