单项选择题

The motion of ocean water ______ at different depths below the surface.

A．modifies
B．varies
C．alters
D．differs
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单项选择题
To appropriately recognize donors for their generosity, you should always ______ their names under the appropriate membership category in your annual report.
A．keep down
B．let down
C．put down
D．slow down
单项选择题
The two countries are obliged to abide by the international conventions and ______ of these chemical weapons under the convention.
A．impose
B．disclose
C．dispose
D．depose
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