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

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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

单项选择题

At the World Literacy Center, an organization that works to help people read, the helpers work hard, enabling them to successfully reach their goals（）.

A．assistants
B．volunteers
C．part-timers
D．amateurs

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