诊断AMI灵敏度最高的是（）。
A.CK
B.CK-MM
C.CK-BB
D.CK-MB
E.CK-MB异型
参考答案：E
—John had his hair cut yesterday afternoon, ______?
—______. He had no time and he had to finish his homework first. [ ]
A. haven't he; Yes, he did
B. didn't he; No, he didn't
C. hadn't he; No, he didn't
D. hasn't he; Yes, he has
简述班集体的基本特征？
