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
Humans should not develop their economy at the ______ of the ecological environment.
A．destruction
B．pollution
C．expense
D．mercy
单项选择题
______ flees if one is constantly subjected to demeaning orders.
A．Prime
B．Harassment
C．Conceit
D．Pride
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