单项选择题

Let us hope that ______ a nuclear war, the human race might still survive.

A．for the sake of
B．in the event of
C．in relation to
D．in return for
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单项选择题
He had a (n) ______ habit of emptying ash trays out of his upstairs window on to our doorsteps.
A．uneducated
B．persuasive
C．uncultivated
D．offensive
单项选择题
A censor's duty is to ensure that no content is ______ in publications or films.
A．optional
B．opaque
C．obscure
D．obscene
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