单选题
A tunnel would be ______.
A、
less expensive to be built than a bridge
B、
more expensive to be built than a bridge
C、
less expensive to be built than a rail
D、
more expensive to be built than a rail
【正确答案】
A
【答案解析】
本题考查的是考生对细节的把握。答案对应于文章的第二段，其中提到“建桥的成本比建隧道高得多”，所以选A
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