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It can be inferred from the first paragraph that
A.the 1957 influenza infected 250,000 people in America
B.Asia was the cradle of the 1957 influenza pandemic in America.
C.Maurice Hilleman went to Asia to Collect the sample of the influenza
D.it was quite time-consuming to study the genetic structure of the influenza

A.the
B.Asia
C.
C.Maurice
D.it

【参考答案】

B
推理判断题。根据题干定位到第一段。其中讲到有关1957年流感的起源,原文提到firstgotawhiffoftheso-calledAsianflu意为“第一次听说所谓的亚洲型流感”,以及后文说明香港有大约25万人感染上了类似流感的症状,故判定B项正确。