Aftersomeexperiments,thedoctorsfoundthat______.
A.theinfluenzacouldbecuredlikeothertypesofinfluenza
B.theinfluenzamustbetr eatedinaspecialway
C.theinfluenzadidnothavetobetr eated
D.theinfluenzacouldnotbecuredbyanyknownmedicine
正确答案：D答案为D。根据第三段最后一句，Thisthen，wassomethingnew：anewinfluenzavirusagainstwhichthepeopleoftheworldhadnoreadyhelpwhatsoever作出该项选择。其他选项在文章中根本未提。
