单项选择题

With few exceptions, evidence indicated that the quality of the air, water, land, and living re sources continued to _______.

A．aggravate
B．deteriorate
C．decay
D．impair
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单项选择题
Each individual is _______ with the essential defenses to ward off bacterial invasion.
A．endowed
B．enriched
C．enlightened
D．entailed
单项选择题
Experts disagree as to why crime rates have continued to fall. Some say the U.S. _______ economy has made crime less attractive.
A．rotary
B．robust
C．rigorous
D．reckless
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