– Could you tell me his phone number?

-- _______ the phone book and find it out yourself.

A．Look up

B．Search for

C．Refer to

D．Going through

顶底板岩石的分类方法一般有（）几种。

A、按岩石成分来分

B、按顶板与煤层相对位置分类

C、按直接顶岩层的稳定性分类

D、按老项稳定性分

E、按伪顶稳定性分