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
Things went well for her during her early life but in her middle age her _______ seemed to change.
A．affair
B．luck
C．event
D．chance
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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