单项选择题

The structure of the family，which is a basic unit of the society，changes along with the development of the society．

A．家庭结构是社会结构的基本单位，它们随着社会的发展而变化。
B．家庭结构是社会结构的基本单位，同社会一起向前发展。
C．家庭是社会的基本单位，它的结构随着社会的发展而变化。
D．家庭是社会的基本单元，同社会一起向前发展。
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单项选择题
It can be inferred from the first paragraph that long time ago many people did not know the sky is __________.
A．a circle
B．space
C．a star
D．a planet
单项选择题
What people of old times actually saw in the night sky were __________.
A．some stars that look like certain things
B．clouds in a rainy day
C．stones hanging in space
D．shadows of the heavenly bodies
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