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

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

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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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