单项选择题

The question was discarded, because it was ambiguous.

A．incorrect
B．biased
C．vague
D．dull
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The rapid expansion of cities during the Industrial Revolution created a housing crisis.
A．avoided
B．brought about
C．aggravation
D．started with
单项选择题
After the ______ application is approved, the cyberspace should not be left untouched.
A．smog
B．blog
C．blob
D．blot
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