单项选择题

__ is the mother of invention.

A．Negligible
B．Needless
C．Necessity
D．Necessarily
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单项选择题
Anyone who refuses too often to listen to the other side of a question risks becoming __ minded.
A． thin
B．narrow
C．thick
D．sorrow
单项选择题
Unfortunately war __ in the Middle East on October 6, 1973.
A．broke out
B．broke off
C．broke through
D．broke away
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