单项选择题

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

A．silent
B．motionless
C．seated
D．true

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单项选择题
That uniform makes the guards look absurd.（）

A．serious
B．ridiculous
C．beautiful
D．impressive
单项选择题
The symptoms of the disease manifested themselves ten days later.（）

A．eased
B．appeared
C．improved
D．relieved
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