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
Chimpanzees are frequently used as stand-ins for human beings in experiment.()

A. partners
B. role-models
C. stand-bys
D. substitute
单项选择题
The advertising industry has resorted to self-regulation in a serious effort to curtail not only bad taste but also misrepresentation and deception in copy and illustrations.()

A. avert
B. deny
C. exclude
D. reduce
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