You may ______ your teachers for help wh

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问题选择题

You may ______ your teachers for help when you have problems.[ ]

A. turn up

B. turn down

C. turn to

D. turn off

答案

答案：C

单项选择题

A bond is needed when the bill of lading cannot be availed of the time of entry of the im- ported commodities. What does the sentence mean.（）

A. A bond is needed when the bill of lading is unavailable when the goods arrive at the destination.

B. A bond is needed when the bill of lading arrives at the port of destination.

C. A bond is not needed when the goods arrive at the destination.

D. A bond is needed when the goods arrive at the destination if there is no bill of lading at all.

填空题

土地分类系统主要包括土地自然分类系统、土地评价分类系统、（）分类系统。