Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtual

游客2025-01-28 27

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

选项 A、surfaced with
B、raised the price of
C、discovered
D、elevated

答案 C

解析句意：自从乔纳斯.索尔克发现小儿麻痹症的疫苗，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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SinceJonasSalkcameupwithhispoliovaccine,infantileparalysishasvirtual