It was hard for him to learn English in a family, in which_____ of the parents spoke the language. 

A．none

B．neither

C．both

D．either

国际工程投标报价的组成中，属于施工机械使用费的有（）。

A.危险作业意外伤害保险费

B.基本折旧费

C.场外运输费

D.维修保养费

E.燃料动力费