单项选择题

You will be late ______ you leave immediately.

A. unless
B. until
C. if
D. or
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单项选择题
What makes the space shuttle ______ is that it takes off like a rocket but lands like an airplane.
A. exceptional
B. strange
C. unique
D. rare
单项选择题
Expected noises are usually more ______ than unexpected ones of the like magnitude.
A. manageable
B. controllable
C. tolerable
D. perceivable
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