单项选择题

Tile author raises issues that would most concern which of the following groups

A．Electricians.
B．Environmentalists.
C．Aviators.
D．Teachers.
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单项选择题
The author mentions people dying of air pollution in ______.
A．Illinois
B．Pennsylvania
C．New Jersey
D．Washington
单项选择题
Scientists have not yet determined ______.
A．all of the effects of pollution on the human body
B．how pollution can be controlled successfully
C．when the atmosphere first became polluted
D．how to wash the black snow clean
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