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
Critics of the Wright brothers thought that the idea of a flying machine was totally
A．absorbing
B．exciting
C．absurd
D．immoral
单项选择题
For the past few years Susan had been _______ her income by the creation of fiction under a pen name.
A．extending
B．magnifying
C．exceeding
D．supplementing
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