单项选择题

There is not a conductor ______ resists the flow of the electrical charges.

A．which
B．but
C．that
D．it
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单项选择题
Scientists think ______ helps some trees to conserve water in winter.
A．when losing leaves
B．leaves are lost
C．that losing leaves
D．the leaves losing
单项选择题
Just as the soil is part of the earth, ______ the atmosphere.
A．as it is
B．the same is
C．so is
D．and so is
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