What were the positive results coming from the urban renewal campaign?
Air and noise pollution decreased.
B. Traffic accidents became less common.
C. Environmental quality degraded.
D. Crime rate became low.
查看答案
“Smart cities” refer to cities that can _____.
A. relieve traffic congestion
B. improve energy efficiency
C. produce more livable communities
D. launch expensive infrastructure projects.
What policies can be implemented to transform congested cities into sustainable and livable oases?
A. Constant adoption of the space-age technologies
B. An increased emphasis on public transportation
C. Vigorous promotion of biking and walking
D. Wisely using the existing land for people-centered cities
在一定条件下允许对指针进行加和减的运算。
A. 对
B. 错
当指针指向数组元素的时候，可以对指针进行加和减的运算。
A. 对
B. 错
微信支付 
支付宝支付