单项选择题

In this densely populated city, acid rain is ______; it is a sign both of industrialization and pollution.

A．prevalent
B．productive
C．popular
D．possible
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单项选择题
If said there were about 500, 000 visitors flocking to the city for the 3rd International Avation and Aerospace Exhibition, that would be a ______ estimate--in fact there are probably a lot more.
A．constructive
B．conservative
C．affirmative
D．progressive
单项选择题
Despite the fact that the two council members belonged to different political parties. They ______ the issue of how to finance the town debt.
A．complicated
B．agreed on
C．avoided
D．reported on
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