单项选择题

______ popularity of subject matter and frequency of use, the books on the two middle shelves will be the most helpful to you.

A．As of
B．As regards
C．As from
D．As against
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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
单项选择题
Humans should not develop their economy at the ______ of the ecological environment.
A．destruction
B．pollution
C．expense
D．mercy
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