单选题
The type of influenza discussed in this story ______.
A、
had been classified years before
B、
could not be cured by any known drug
C、
could be prevented from spreading
D、
could not affect adults
【正确答案】
B
【答案解析】
解析：由文章第三段最后两句可知，该病还没有任何药可以治疗。
提交答案
关闭