2．They were building a bridge across the river, _______ bridge which was intended to carry a great deal of _______ traffic.

A．a; the

B．the; the

C．the; /

D．a; /

中国采用了由FEFCO/ASSCO制定的国际纸箱箱型标准，按照这一标准，纸箱结构可分为（）和组合型两大类。

A.分散型

B.独立型

C.单一型

D.基本型