单项选择题

Questions 26 to 28 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
There is preliminary evidence that XMRV

A．already poses a danger.
B．can spread infection.
C．is transmitted similarly to HIV.
D．threats the blood supply.

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单项选择题

单项选择题

Questions 26 to 28 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. There is preliminary evidence that XMRV 您的浏览器不支持 audio 元素。