生活在牛奶中的一种细菌能制造出日常食用的酸奶,这种细菌是[ ]
A.酵母菌
B.乳酸菌
C.大肠杆菌
D.固氮细菌
答案:B
—That T-shirt with Yao Ming's picture on it _______ belong to David. He admires him a lot.
—No, it _______ his. He hates black color. [ ]
A. can; can't
B. may; needn't
C. must; mustn't
D. must, can't
心肌梗死的并发症不包括()
A.心室壁瘤
B.心脏破裂
C.急腹症
D.栓塞
E. * * 肌功能失调