成都市主要商业街分布在市中心，其体现的商业中心布局原则是（）
A.交通最优
B.资金最优
C.货源最优
D.市场最优
参考答案：D
–There is thick haze(雾霾)around many cities in China recently. What do you think of it ?
---I think __________ cars we drive, the less pollution the city has.
A．the less
B．the fewer
C．the more
D．tyhe faster
