单项选择题

Bills completed by 2000 laid special emphasis _______ recycling and energy conversion.

A．onto
B．in
C．on
D．over
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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
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
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