单项选择题

The heavily-populated area was a breeding place for ______ diseases.

[A] infectious
[B] powerful
[C] influential
[D] suspicious
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The city has decided to ______ smoking.
[A] do away with
[B] take away
[C] get away with
[D] put away
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The World Trade Center, the top ______ was 410 meters high, was the tallest building in the world.
[A] which
[B] of which
[C] of whose
[D] that
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