单项选择题

Every community requires a wholesome, dependable supply of water, and every community generates liquid and solid wastes.

A．considerable
B．healthful
C．immediate
D．secure
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单项选择题
Although the main motivation for a renewed interest in logic was a search for the foundations of mathematics, the chief protagonists of this effort extended their inquiry into the domain of the natural languages.
A．explorers
B．dedicators
C．advocates
D．analysts
单项选择题
The speaker went on and on, ______ to his listeners' obvious boredom.
A．obligated
B．obsessive
C．obvious
D．oblivious
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