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
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Facial tattooing is a standard ______ among certain peoples.
A．custom
B．habit
C．practice
D．tradition
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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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