If the virus of bird flu continues to grow at a fast speed,it could become a bigger ___ than SARS,which killed about 800
问题描述：
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?
答
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.