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

游客2025-02-03 20

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 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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SinceJonasSalkcameupwithhispoliovaccine,infantileparalysishasvirtual