单项选择题

The Mississippi River from the source of its chief headstream to the Gulf of Mexico flows______long.
A．3,782 km
B．3,724 km
C．over 6,000 km
D．about 1,500 km

A.
A．3,782
B.3,724
C.over
D.about

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Which of the following is NOT a characteristic of the burglaries mentioned?
A．They are not serious ones.
B．They are committed by young people.
C．They are the most common form. of crimes in the area.
D．The burglars generally have some record in the past.

A.They
B.
B．They
C.
C．They
D.
D．The
E.

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When is the conversation going on?
A．Twenty days before Christmas Day.
B．Twenty-three days before Christmas Day.
C．A month before Christmas Day.
D．Two months before Christmas Day.

A.Twenty
B.
B．Twenty-three
C.
C．A
D.
D．Two
E.