单项选择题

We need things consumed, burned up, worn out, replaced and______ at an ever increasing rate.

A．canceled
B．dissipated
C．discarded
D．concealed
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单项选择题
The instruction for the imported machines is so______ that it is impossible for us to operate it.
A．intricate
B．ambiguous
C．duplicated
D．confused
单项选择题
After this accident, it will be difficult for the government to______ people that nuclear power stations are safe.
A．prohibit
B．persuade
C．forbid
D．hinder
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