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问题 选择题

目前光污染越来越严重，建筑物的玻璃幕墙、釉面砖墙、磨光大理石等都能造成光污染，形成光污染的主要原因是  [ ]

A、光的反射

B、光的混合

C、光的色散

D、光沿直线传播

答案

答案：A

选择题

Not only ____ interested in football but also ____ beginning to show an interest in it.

A．the teacher himself is ; all his students are

B．the teacher himself is ; are all his students

C．is the teacher himself; are all his students

D．is the teacher himself; all his students are
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单项选择题

在半导体存储器中，动态RAM的特点是( )。

A．信息在存储介质中移动

B．按字结构方式存储

C．按位结构方式存储

D．每隔一定时间要进行一次刷新
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