单项选择题

We must ()on water during the dry season.

A．economical
B．economize
C．economy
D．economically

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单项选择题
Anthropologists usually study simple, unindustrialized societies because the number of()is limited.

A．vehicles
B．variables
C．varieties
D．systems
单项选择题
We should do everything in our power to develop () alternatives to petrol.

A．audible
B．capable
C．liable
D．viable
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