单项选择题

My teacher told me seriously that I should keep ______of that fellow who always caused troubles.

[A] clean
[B] cleanly
[C] clear
[D] clearly
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单项选择题
In the war time, some cities were ______to the ground and thousands of civilians became homeless.
[A] demolished
[B] destroyed
[C] razed
[D] annihilated
单项选择题
As we all know, thick forests are the natural ______for birds, animals and insects, and we must forbid cutting trees without any limitation.
[A] habitat
[B] resort
[C] residence
[D] refuge
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