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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单项选择题
Jim did not like our plan; so he countered it with one of his own.
A．answered
B．opposed
C．rejected
D．replaced
单项选择题
Tom is reliable, so you can count on him.
A．trust
B．skulk
C．recant
D．vilify
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