因工作原因对安监员、测气员、放炮员、防突员等进行打击报复行为的，属于（）。

A、一般“三违”

B、严重“三违”

C、较严重“三违”

You’d better go there by train.The train ticket is____ the airplane ticket.

A．as cheap three times as

B．as three times cheap as

C．three times cheaper than

D．cheaper three times than