单项选择题

The author mentions people dying of air pollution in ______.

A．Illinois
B．Pennsylvania
C．New Jersey
D．Washington
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单项选择题
Which of the following statements can best describe the telephone in the U. S
A．It's very inexpensive.
B．It saves a lot of trouble.
C．It's very convenient.
D．A ,B and C
单项选择题
Scientists are trying to find a link between pollution and ______.
A．intelligence levels
B．antisocial behavior
C．birth defects
D．divorce percentage
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