单项选择题

63（）

A．attendant
B．keeper
C．member
D．aide

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单项选择题
61（）

A．grew
B．was growing
C．grow
D．grown
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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