单项选择题

A．The books are all required for the history course.
B．Some of the books are for courses other than history.
C．He plans to read more than the history class has required.
D．He’s worried he may not finish the required reading.
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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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The well-known singer was _______ at the electronic organ by his school teacher.
A．coordinated
B．cooperated
C．accompanied
D．associated
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