问题描述:
[单选]
Why there is a day and a night on Earth? 为什么地球上有白天和夜晚?
A.Because the Earth rotates on its own axis(自转).
B.Because the Earth moves around the Sun(公转).
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上一篇:Shadows will happen when objects block the path of light.物体挡住光时,会形成影子。
下一篇:When the Sun is high in the sky, the shadow is().当太阳高挂在天空时,影子是()。
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