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[单选题]
The river that serves as the dividing line between the South and the North of the United States is ____.
A.the Columbia River
B.the Potomac River
C.the Ohio River
D.the Colorado River
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B.the Potomac River
C.the Ohio River
D.the Colorado River
The Yellow River is the second ______river in China.
A.long
B.longer
C.longest
D.most long
A.错误
B.正确
A.as long as
B.if
C.unless
D.as soon as
The Great Pyramid______the west bank of the Nile River, not far from Cairo.
A.is located on
B.is situated in
C.is located at
D.is situated of
A.正确
B.错误