摘要： 旅行社含有很多隐性成本.不过.一旦你意识到这一点.这些成本就很容易被发现.而且更加容易消除掉.第二节 写作Dear Sir/Madam,Recently I have heard about some news that many Project Hope Schools in some areas have been deserted. At the news I feel very sad. After all, these Project Hope Schools increase children’s chances of going to school and play an important part in improving the local people’s level of education and thus further their quality of life.Why are they deserted On the one hand, before these schools began to be built, there was a lack of scientific long-term planning and predictions of the development of Chinese education, especially that in the local areas. Therefore, the distribution of schools isn’t reasonable. On the other hand, owing to the social development and the declining population, it’s unnecessary for so many schools to exist.So when we build schools, we must be aware of their development in the future and consider whether there’s l long-term need. And for those deserted schools, they should be made the best of and continue to serve the local areas. Sincerely yours, Li Hua

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