单项选择题

When he was a young man, he traveled about the world ______.

A．on its own
B．of its own
C．on his own
D．of his own
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单项选择题
There are signs ______ restaurants are becoming more popular with families.
A．that
B．which
C．in which
D．whose
单项选择题
______, electrons are still smaller.
A．As small atoms are
B．As atoms are small
C．Small as atoms are
D．As small atoms
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