单项选择题

These gases pollute the atmosphere of towns and cities.

A．air
B．water
C．earth
D．feeling
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单项选择题
What makes a mayor successful in Los Angeles is the strength of his public support.
A．concentration
B．intensity
C．conservation
D．stress
单项选择题
I was deeply impressed by the assurance with which the student answered all my questions.
A．independence
B．confidence
C．insurance
D．reluctance
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