单项选择题

The commission will _______ the cause of the accident, focusing especially on safety is sues.

A．investigate
B．search
C．survey
D．explore
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单项选择题
In Japan, a most competitive society, with stronger _______ than ours, children are ready to test their limits every day in many fields, including music.
A．confinement
B．principle
C．convention
D．discipline
单项选择题
The superior didn't have time so far to go into it _______,but he gave us an idea about his plan.
A．at hand
B．in turn
C．in conclusion
D．at length
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