下述哪一项不是胆总管结石所致黄疸的特点()
A.黄疸波动较大
B.痛时可有发冷发热
C.大便呈进行性陶土色
D.大便隐血试验阴性
E.血清转氨酶增高后迅速下降
参考答案:C
—John, why are you so tired?
—I ______ pingpong with Jimmy.
A.play
B.played
C.have played
D.have been playing
简述体育教学与训练区别。