单选题
Which is the main idea of this passage?
A、
Dark-colored clothes are warmer in the sunlight.
B、
Objects absorb part of the sunlight.
C、
Color is caused by reflected light rays.
D、
A red object reflects mostly red light.
【正确答案】
C
【答案解析】
第二段第一句话是该题的答案，C正确。
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