7 2.结尾段的表达方式：1）. 总结全文；To conclude, we can see that none of the problems is easy to solve and that each is related to the others. Because of the money shortage, the scientists cannot do proper research, so we cannot expand our work. The lack of data from research results in our not being able to demonstrate our work to get enough money from the government. The best solution is to choose a particular area and work on the problems that exist there, gathering data and solving problems; then we can present these data to the government to make them see how very important the Watershed Management Division is.
8 2). 回答段首问题：If a day-care center offers personnel, a spacious and safe environment, and creatively designed equipment, it can be a positive influence on a child. As recent studies have shown , there is no reason why a well-run day-care facility cannot be as warm and as stimulating as the child’s home. As working parents realize this , many are passing up the traditional baby-sitter and turning to day-care centers.
9 3）. 发出号召：Every month the Food and Drug Administration finds that another food additive has harmful effects on humans. In spite of this, food processors seem reluctant to eliminate additives from their food. It seems as if the only way we, the consumers, will be able to make our desires felt is to stop buying food that contains artificial preservatives and flavor enhancers. It is time for us to take an active part in determining what we eat.
10 4). 反问结尾（用诘问句结尾让读者自己去深思、解答。）： The big question today is , how can an expanding world population find food and space without destroying the land it lives on ?