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

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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
单项选择题
The countries that are being blamed for the extra greenhouse gases in the atmosphere are the rich and developed countries. On a different (), the developing countries feel they will suffer the most of it.

A. nod
B. note
C. norm
D. notion
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