单项选择题

We have to install new water pipes in our house; these are corroded.

A．worn thin
B．worn away
C．worn up
D．worn hollow
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单项选择题
The findings of the two studies contradict each other, though both groups of scientists have used the same method.
A．agree with
B．confirm
C．complement
D．disagree with
单项选择题
Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien.
A．insane
B．infectious
C．foreign
D．poisonous
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