单项选择题

The readers were warned to be cautious when buying items ____________.

A．on credit
B．at a discount
C．on promotion
D．advertised in television
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单项选择题
The passage is mainly concerned with ____________.
A．various ways to protect their rights
B．the free enterprise system in America
C．creative techniques in marketing
D．the advances of advertising techniques
单项选择题
According to the first paragraph, it can be inferred that in President Nixon's first term ____________.
A．he made a series of reforms such as social reform and education reform
B．he nominated many officials to the various departments
C．Americans made a breakthrough in the space technology
D．Americans took interest in the space technology
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