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
Attending a church, temple, or mosque is one way to make agreeable friends.
A．enduring
B．congenial
C．elderly
D．numerous
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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