Without the sun, there would be no ______. The change of day and night is caused by ______.

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问题 Without the sun, there would be no ______.
The change of day and night is caused by ______.

选项 A、hours
B、lighted side
C、dark side
D、the sun

答案D

解析 白天和黑夜的变化都是因为太阳引起的,所以应该选D答案。
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