1.China has large population of 13 million.
2.In the past twenty years,China has changed a lot especially the agriculture.
3.China only occupied 7% land of the world,but plant 1/3 paddy rice,which raise the population of 22% in the world.
4.People also make use of discarded vegtable to keep chicken and pig,and utilize the faeces as the resources for hot input and cook.
5.第五句是不是没有说完?