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

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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

单项选择题

Why did President Nixon have to resign later

A．Because he signed an agreement with North Viet Nam.
B．Because many administration officials resigned.
C．Because he may encounter the impeachment due to the scandal.
D．Because Vice President Spiro Agnew resigned.