题目
The underground connection system is _______ two levels.A. made inB. made up ofC. made from
The underground connection system is _______ two levels.
A. made in
B. made up of
C. made from
题目解答
答案
B. made up of
解析
此题考察的是固定搭配的使用。选项A "made in" 意为“在...制造”，选项B "made up of" 意为“由...组成”，选项C "made from" 意为“由...制成”。根据题意，地下连接系统是由两个层次组成的，因此应选择 "made up of"。