单项选择题

Encouragement is sometimes much more _____ than criticism.

A．effective
B．efficient
C．executive
D．extensive
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单项选择题
Please join us. We can easily make _____ for one more at this table.
A．seat
B．place
C．room
D．space
单项选择题
_____ the first to use nuclear weapons.
A．At no time China will be
B．Never China will be
C．Will China never be
D．At no time will China be
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