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
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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
单项选择题
They discussed the problem three or four times, but could come to no ______.
A. end
B. conclusion
C. result
D. judgment
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