“乐府三绝”不包括（）。
A、秦妇吟
B、长恨歌
C、孔雀东南飞
D、木兰辞
参考答案：B
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
脚手架施工操作层及以下连续三步应铺设脚手板和( )高的挡脚板。
A．150mmB．180mmC．200mmD．220mm
