单项选择题

Transporting the trash to the rural areas is considered as __________.

A．an effective solution
B．a costly solution
C．a dangerous solution
D．a feasible solution
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单项选择题
Experiments showed that nondrinkers had __________.
A．higher blood pressure
B．lower blood pressure
C．larger amounts of good cholesterol
D．smaller amounts of good cholesterol
单项选择题
The outdated methods of dealing with garbage are now considered unacceptable because of __________.
A．lower efficiency
B．water shortage
C．limited space
D．higher risk
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