单项选择题

气溶胶中粒径（）um的颗粒，称为飘尘。

A．>10
B．<5
C．>15
D．<10

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单项选择题

The girl that used to learn how to play clarinet from Mr. Holland later becomes a (n) _______.
A、excellent clarinet player
B、successful businesswoman
C、successful governor
D、excellent teacher

单项选择题

视区位于

A．颞横回
B．枕叶皮质
C．颞中回
D．颞下回
E．缘上回