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单选题
_____
A
lengths
B
speeds
C
colors
D
brightness
参考答案
参考解析
解析：
语篇题。承接上句，光是由不同颜色的波组成的，而我们也知道诸如红外线、紫外线这种不同颜色的光线，波长是不一样的，因此这里应选length，表示光的波长。
语篇题。承接上句，光是由不同颜色的波组成的，而我们也知道诸如红外线、紫外线这种不同颜色的光线，波长是不一样的，因此这里应选length，表示光的波长。
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