贸易保护政策分为（）等几类。
A.限制进
B.保护出口
C.配额限制
D.反倾销税
E.非关税壁垒
参考答案：A, B
To enjoy the view on the way, Mary would rather spend long hours on the train travel by air.
A．as
B．to
C．than
D．while
代议
