单项选择题

But there are no convincing reasons for believing that this would have a _______ effect on economic performance.

A．partial
B．preferable
C．beneficial
D．liable
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单项选择题
The well-known singer was _______ at the electronic organ by his school teacher.
A．coordinated
B．cooperated
C．accompanied
D．associated
单项选择题
This may have _______ the elephant from being wiped out as well as other animals hunted in Africa.
A．reserved
B．preserved
C．maintained
D．retained
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