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.

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单项选择题

What can be inferred from the passage

A．The nondrinkers are much healthier than those who drink alcohol.
B．Moderate drinking can help to prevent the incidence of the cancer.
C．Moderate drinking is worthy of being recommended to everyone.
D．People who drink too much alcohol take more risks than teetotalers.

单项选择题

It can be learned that moderate drinking __________.

A．is recommended by most doctors for heart patients
B．should be permitted on prescription
C．is still not medically advisable
D．is not related to liver problems