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The recent outbreak of bird flu results in______. [br] H5N1 is a flu strain ____
The recent outbreak of bird flu results in______. [br] H5N1 is a flu strain ____
游客
2023-07-12
65
管理
问题
The recent outbreak of bird flu results in______. [br] H5N1 is a flu strain ______.
选项
A、limited to Hong Kong
B、which first affected human beings in 1961
C、crossing species barriers
D、which was first isolated from American birds
答案
C
解析
细节题。题干中出现的关键词H5N1 特征性很强,在文中第四、五段出现过两次,需依次分析。根据第四段第一句话及与其对应的上一段中的cross species infections可知:H5N1是从鸟类转移到人类身上的一种跨物种传染的病毒。因此C是正确的。文中第四段末虽提到过人类受H5N1 型病毒感染的案例全部发生在香港,但这种病毒是在非洲鸟类身上被分离出来,所以说这种病毒变种仅存在于香港是错误的,排除A。1961 年为病毒首次被分离的时间,第一次人类感染的时间为1997年,B错误。D中的American birds应改为South African birds。
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