题目内容

Optimal routing is a foundation of safe and economical (navigation).

A. 海军
B. 灌溉
C. 航行
D. 谈判

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The （provision） of urban transport also involves issues of social justice.

A. 视力
B. 支持
C. 复习
D. 供应

There was a smell of （stale） vegetables in the air.

A. 陈腐的
B. 童话
C. 匾额
D. 刀片

There is no (substitute) for practical experience.

A. 模仿
B. 恐吓
C. 代用品
D. 亲密

This tree looks high and strong but actually its trunk is (hollow).

A. 中空的
B. 黄色
C. 吞下
D. 机构