单项选择题

His manner was so pleasant that Bolla felt at ______ with him at once.

A．peace
B．large
C．ease
D．best
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单项选择题
Can you take the day off tomorrow -Well, I'll have to get ______ from my boss.
A．permission
B．permit
C．allowance
D．possession
单项选择题
The ______ problem of bring a space-ship back from the moon has been solved.
A．technical
B．technological
C．technique
D．technology
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