单项选择题

Some metals are better conductors of electricity than others,______ means that the former has atoms that contain more free electrons than the latter.

A．that
B．this
C．it
D．which
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单项选择题
Is it necessary to______ our body to the sunlight
A．reveal
B．display
C．expose
D．show
单项选择题
His understanding made a deep impression ______ the young girl.
A．in
B．on
C．for
D．to
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