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
The sense of mistrust is compounded by smaller annoyances that leave the families feeling as though no one in authority cares about them.（）

A．offset
B．intensified
C．diminished
D．annulled
单项选择题
The National Industrial Recovery Act was designed to spur industry.（）

A．tax
B．stimulate
C．censure
D．rebuke
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