单项选择题

When the sun rises or sets, the sky has many kinds of colors except for __________.

A．red
B．pink
C．gray
D．orange
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单项选择题
From the whole article it can be concluded that human beings __________.
A．feel like having more space
B．remain much interested in space all the time
C．are quite imaginative
D．are fond of distant traveling
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
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