单项选择题

BIRD-X offers pest bird control products to ______, control and get rid of birds.

A．compel
B．propel
C．repel
D．dispel
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单项选择题
You have to be ______ when you try to work out mathematical formulas.
A．reasonable
B．rational
C．logical
D．sound
单项选择题
That politician's behavior was ______ as to cause widespread condemnations all over the world.
A．so
B．that
C．such
D．this
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