是否需要在网上开展营销活动，在很大程度上取决于行业的特点和产品的特性。（）
参考答案：对
— You used to the bus to school, didn’t you?
— Yes, I did. However, I am used to to school now.
A．take; walk
B．take; walking
C．taking; walking
D．taking; walk
食管癌主要诊断方法是（）
A.气管镜
B.纤维食管镜
C.B超
D.食管钡餐X线检查
E.食管拉网脱落细胞检查
