单项选择题

If I do something in vain, I do it ______.

A．without interest
B．without success
C．with difficulty
D．with ease
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单项选择题
Being ignorant of the law is no ______of breaking the law.
A．reason
B．excuse
C．ground
D．point
单项选择题
Air, or ______ is called atmosphere, surrounds the whole earth.
A．it
B．that
C．which
D．what
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