单项选择题

My parents moved out of their old home sometime last year after they had celebrated their 50th year there（）.

A．anniversary
B．years old
C．age
D．wedding

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单项选择题
The doctor preferred to resign rather than be accused publicly of infamous conduct（）.

A．unknown
B．extraordinary
C．mysterious
D．disgraceful
单项选择题
Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtually disappeared from the United States（）.

A．surfaced with
B．raised the price of
C．discovered
D．elevated
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