Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtually disappeared from the United States。

A. caught

B. raised the price of

C. developed

D. elevated

【答案解析】本题正确选项C。【译文】自从乔纳斯·索尔克(Jonas Salk)研制出脊髓灰质炎疫苗以来，小儿麻痹症几乎从美国消失了。【解析】在四个备选项中，A项caught“捕捉（catch 的过去分词）”；B项raise the price of“提高价格”；C项develop“开发，研制”；D项elevate“提拔，提升”。这里需要选择和题干中的画线词come up with“提出；想出”意思相近的词，因此，依据题意本题最合适的选项为C。