The gap between rural and urban education in China is widening, and education is the key

to _____ rural problems. [ ]

A. solving

B. solve

C. have solved

D. having solved

有关轮状病毒错误的是（）

A.B群仅在我国成人中暴发流行

B.病毒基因组为双股RNA

C.C群是引起婴幼儿腹泻并致死亡的主要病原体

D.是全世界范围内婴幼儿重症腹泻最重要的肠道病毒

E.ELISA方法是检测病毒抗原的首选方法