单项选择题

_______ is to arrange them in groups or sequences according to a plan.

A．Things classified
B．In classifying things
C．As classification of things
D．To classify things
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单项选择题
_______ the Atlantic Ocean crosses the equator, the trade winds cause a flow of water to the west.
A．Where
B．And
C．That
D．At
单项选择题
The more arid the continent, the less the amount of annual precipitation _______.
A．runs off that
B．runs it off
C．that runs it off
D．that runs off
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