If the virus of bird flu continues to grow at a fast speed,i

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If the virus of bird flu continues to grow at a fast speed,it could become a bigger ___ than SARS,which killed about 800 people last year.
a.question b.problem c.disease
为什么这里选A,而不是 B,怎么区别?

我也觉得应该选B
后半句which指代的是一个问题question.而这个问题即是如果禽流感的病毒持续快速增长的问题.
而这个问题将会比非典型肺炎更严重.

If the virus of bird flu continues to grow at a fast speed,i 英语选择题When the virus of bird flu manages to get into one's bo I asked the girls if they were afraid of Bird Flu.改为直接引语 i asked the girls if they were afraid of Bird Flu.改为被动语态 i__ C___ of bird flu are difficult to cure at present. the computer,woring very fast ,_data at the speed of light A ___ should you do to keep from getting the flu virus?A.What The flu is believed to be caused by virus. The research on the new bird flu virus vaccine is challengin According to one WHO official,the longer the virus of bird f an expert team --- to study h7n9 bird flu virus in april 201 英语首字母填空1.The bird flu virus is pretty s____,it's not so easy