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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单项选择题
Scientists can see farther out into space with the help of __________.
A．the light from space
B．the stars in space
C．some new and larger telescopes
D．the clear background
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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