A
1-5. billion; increase; causes; enough; jobs
B
1-5. increasing; born; longer; cities; space
D
How many babies are born every minute in the world?
China has a population of 1.39 billion.
There is a lot of traffic and pollution.
That causes a lot of problems such as too much traffic.
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024