单项选择题

A great deal has been done to remedy the situation().

A. maintain
B. improve
C. assess
D. protect

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单项选择题
At 90, many individuals still remain healthy and energetic.()

A. intelligent
B. rough
C. robust
D. revivable
单项选择题
To flame up his boss, Dick had to make up evidence().

A. collect
B. disclose
C. invent
D. generate
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