Parents shouldn’t be too ______________ towards their children; they should let them be more independent.

A．genuine

B．protective

C．close

D．outspoken

PDP产品中滤光玻璃的作用是（）。

A.装饰作用

B.提高有环境亮度时的对比度

C.滤除红外辐射

D.防止PDP屏被冲击破损