no.7 what it the basic reason for building pedestrian mall in the city center?
a. To increase the detail activity in the area
b. To reduce the noise made by automobile traffic
c. To increase shopping conveniences for city residents
d. To encourage people to move from the suburbs into the downtown
答案是a, 我可以判断出b和d是明显的错误, 但是我选的c, 至少这个在原文中可以体现出来,难度错在 city residents?