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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单项选择题
Caroline ______ her speech when a stranger rushed in and interrupted her.
A．was to finish
B．finished
C．had finished
D．was to have finished
单项选择题
Facial tattooing is a standard ______ among certain peoples.
A．custom
B．habit
C．practice
D．tradition
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