下列细菌除哪一项外,均可引起食物中毒()
A.蜡样芽胞杆菌
B.产气荚膜梭菌
C.伤寒沙门茵
D.肉毒梭菌
E.坏死梭杆菌
参考答案:E
在生物分类单位中,最大和最小的单位分别是[ ]
A.界 纲
B.门 科
C.界 种
D.门 种
This is one of the best films that ___ this year. [ ]
A. is appearing
B. appear
C. has appeared
D. have appeared