单项选择题

The old concerns lose importance and some of them vanish altogether.

A. develop
B. disappear
C. link
D. renew
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单项选择题
These programs are of immense value to old people
A. natural
B. fatal
C. tiny
D. enormous
单项选择题
Since the Great Depression, the United States government has protected farmers from damaging drops in grain prices.
A. slight
B. surprising
C. sudden
D. harmful
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