互联网被公认为是（）。
A.第一媒体
B.第二媒体
C.第三媒体
D.第四媒体
参考答案：D
促销的方式主要有（）、非人员促销两类。
A.人员促销
B.广告促销
C.展会促销
D.销售促销
Maybe if I _____ science, and not literature then, I would be able to give you more help. [ ]
A. studied
B. would study
C. had studied
D. was studying
