可引起出血性大肠炎,并能引起致死性并发症如溶血性尿毒综合征的大肠埃希菌是()
A.O139
B.O55
C.O157:H7
D.O111
E.O157
参考答案:C
与我国相邻的国家有______个,与我国隔海相望的国家有______个.
No one knows _____ in the future. [ ]
A. what will be happen
B. what it will be happen
C. what will it happen
D. what will it happen