拍卖采用先看货、当场叫价、落槌成交的做法，属于公开竞卖的方式。 ( )
参考答案：错
The old lady _________when I was in the countryside is said to be still very much alive though in her nineties.
A．after whom I looked
B．whom I took care
C．who I looked after
D．of whom I took care
流行病学的研究范围是（）
A.地方病
B.慢性病
C.疾病与健康状况
D.传染病
E.地方病与传染病
