题目内容
Healthy trees are important to us all. Trees provide shade, beauty, and homes for wildlife. Trees give us products like paper and wood. Trees can give us all these only if they are healthy. They mustbe well cared for to remain healthy.Your trees’ trouble may be you yourself. People spend much time and money to plant and maintain trees. Trees improve the looks of homes, parks, business, and public buildings. Yet, people who love trees the most may be the ones who cause them injury. Of course, they do not do this on purpose. They are most likely not aware of the kinds of things that injure trees. There are many people-caused tree injuries. You should become aware of them and avoid them. Learn the things that can help to keep your trees healthy.Healthy trees are beautiful. They make our world a pleasant place to live. Unhealthy trees are not as beautiful. They make our world less pleasant. Healthy trees help to cool and clean the air. They can even deaden(闷抑) sound. Unhealthy trees cannot help or protect the environment. Trees, like people, are disturbed by changes around them. Construction of building is a major cause of tree injury. People who love trees may（）
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如果电路需要稳定输出电流，且增大输出电阻，可以选择引入下列哪种负反馈（）
Which of the following could replace the phrase "preside over" in the first sentence of the second paragraph
需要考虑评估对象的实体性贬值、功能性贬值和经济性贬值的资产评估方法是（）。
Why do people in all countries ride buses to school, to work, and to far places Buses can go where trains and airplanes cannot. They do not cost as much to travel on. Even though they may not move as fast as airplanes and trains, they sometimes take people between two places faster. This is be- cause they may travel a more direct way, or may leave more often, or at better times.Buses come in different sizes. A small bus can carry only eight or ten people. A large one might have seats for fifty to seventy people and have standing room for more.Thousands of yellow school buses carry millions of children to school every year. Most of these buses have seats placed quite close together to fit in as many children as possible. Some schools buy their own buses. Others pay to use buses that belong to bus companies.City and town buses carry people for short distances. The seats of these are close together, and there is standing room as well. Most city buses have two doors so that people can get on and off quickly.long-distance buses go from state to state or country to country. They give people the chance to travel across huge stretches of land. These buses have comfortable seats that can be moved to different positions. They have places to store suitcases. Many have washrooms. All these things are important on a long trip. A large bus might carry（）people.
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