单项选择题

A galaxy is the name of ______.

A．a large group Of stars
B．the sun
C．planets like the earth
D．the universe
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单项选择题
Man has known that ______.
A．the Milky Way is the only galaxy
B．other galaxies are near ours
C．the sun is a large star in the Milky Way
D．the earth is a small part of the universe
单项选择题
In the Milky Way we can see many ______.
A．galaxies
B．suns like ours
C．stars like our sun
D．both B and C
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