单项选择题

We've tested three hundred types of boots, ______ is completely waterproof.

A．no of which
B．none of which
C．some of that
D．neither of which
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单项选择题
______ makes men different from the other animals is that they can think and speak.
A．That
B．The thing
C．All
D．What
单项选择题
At first I thought that math problem would be rather difficult, but it ______ to be fairly easy.
A．turned out
B．turned up
C．turned on
D．turned over
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