单项选择题

I'm sorry to tell you that the materials you wanted are ______.

A. taken off
B. put up
C. sold out
D. got off
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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
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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