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

The word repel (Line 6, Para. 2) can be best replaced by __________ .

A．speed up
B．drive back
C．slow down
D．deal with

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