单项选择题

Some of the larger birds can remain stationary in the air for several minutes.（）

A．motionless
B．silent
C．seated
D．true

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单项选择题
The symptoms of the disease manifested themselves ten days later.（）

A．eased
B．improved
C．relieved
D．appeared
单项选择题
His professional career spanned 16 years.（）

A．started
B．changed
C．lasted
D．moved
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