单项选择题

Some drugs taken in large quantities can cause permanent brain damage.

A．temporary
B．lasting
C．dangerous
D．serious
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单项选择题
A judgement may be revised or reversed in the light of some particular action.
A．changed
B．overtaken
C．resolved
D．resumed
单项选择题
The duty of a soldier is to defend his country.
A．resist
B．assure
C．guard
D．contribute
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