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单选题
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
参考答案
参考解析
解析：
习语辨析题。句意：自从Jonas Salk发现小儿麻痹的疫苗，美国的小儿麻痹症几乎消失了。come up with在这里意为“想出”。discover意为“(首次)发现，找到”用在句中符合句意，所以选C。raise the price of抬高……的价格。elevate举起；提拔。
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