单项选择题

The most typical feature of the Moon's surface is its _______ of carters, the largest of which are more than one hundred miles in diameter.

A．abundance
B．type
C．tolerance
D．depth
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单项选择题
Limestone that can be highly polished is _______ marble.
A．substituted by
B．known as
C．regular as
D．improved by
单项选择题
The tour of our country by the foreign visitors _______ on the Great Wall and other historical spots.
A．confirmed
B．focused
C．instructed
D．hampered
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