单项选择题

Mrs. Keller could do all housework because ______.

A．she had no money to employ a helper
B．she was strong enough to do all at home
C．she-didn't believe anybody
D．only she was free at home
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单项选择题
We use ______ to work out how far a star is from us.
A．kilometres
B．metres
C．light-years
D．months and years
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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