卖方垄断市场主要具备的特点有（）。

A.卖者和买者都比较多

B.产品无相近的替代品

C.买者和卖者无串通共谋行为，也没有政府干预。

D.新生产者不能进入市场

E.市场信息比较完全

Smoking increases the risk of heart disease. The average smoker is about ____ to die of a heart attack as

a non-smoker. [ ]

A. twice more likely

B. twice so likely

C. twice as likely

D. twice likely