单选题
Since Jonas Salk {{U}}came up with{{/U}} his polio vaccine, infantile paralysis has virtually disappeared from the United States.
A、
surfaced with
B、
raised the price of
C、
discovered
D、
elevated
【正确答案】
C
【答案解析】
[分析] 习语辨析。 come up with想出，提出，提供；raise the price of抬高……的价格；discover (首次)发现，发觉，找到；因此C为答案。
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