【正文】
eason is simple, because those parents who have only one child can spend more time with their son or daughter. Parents’ love, if it is modest, can help children to establish selfconfidence, sense of security and deep relationship between parent and children.7. It is a fact that the conflict between human beings and nature is the basic contradiction of survival and development. The relation between man and natural disaster is a obvious presentation of this contradiction. We have to coordinate economy development and environment protection if we want to reduce the loss caused by natural calamities. In fact, to reduce natural calamities has bee one of the necessary actions to make sure sustainable development.8. People need more and more water. At the same time, water supply is reducing because of drying out of underground water and wasting of water. It is very necessary to make a new strategy now to avoid lack of fresh water which will lead to agricultural reduction of output, families and factory departments having no water to use, environment destruction and degeneration of waterrelated health problems.