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
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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The outdated methods of dealing with garbage are now considered unacceptable because of __________.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
单项选择题
The main idea of the passage is that __________.
A．new approaches are found to solve the garbage problem
B．garbage disposal becomes a growing problem with limited solutions
C．garbage pollution is becoming more and more serious
D．recycling is an effective way to handle the waste
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