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Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtual
Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtual
游客
2023-12-30
39
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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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