单项选择题

Criticism without suggesting areas of improvement is not（）and should be avoided if possible.（）

A．constructive
B．productive
C．descriptive
D．relative

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单项选择题
Millions of tons of water are （） by a complex system of dykes.

A．held up
B．held on
C．held out
D．held back
单项选择题
The manager didn't have time to go into his plan （）, but he gave us an idea about it.

A．in turn
B．in conclusion
C．at first
D．at length
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