题目内容：
When someone has flulike illness，why will a swab be taken in the nose and sem to the lab?
A．To find more infections than under nonnal circumstances． B．To examine if it is influenza or swine flu．
C．To see if the illness is serious．
D．To stop the illness spreading to other areas．
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：