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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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
单项选择题
The dichotomy postulated by many between morality and interests, between idealism and realism, is one of the standard clichés of the ongoing debate over international affairs（）.

A．division into two parts
B．combination of two parts
C．disparity
D．contradiction
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