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  3. Healthy trees are important to us all. Trees provide shade, beauty, and homes for wildlife. Trees give us products like paper an

Healthy trees are important to us all. Trees provide shade, beauty, and homes for wildlife. Trees give us products like paper an

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问题     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 must be well cared for to remain healthy.
    Your trees’ trouble may be you yourself. People spend much time and money planting and maintaining trees. Trees help to improve the looks of homes, parks, 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 who cause tree injuries. You should become aware of the injuries and avoid causing 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 in. Unhealthy trees are not as beautiful. They make the world less pleasant. Healthy trees help to cool and clean the air. They can even deaden sound. Unhealthy trees cannot help or protect the environment. Trees, like people, are disturbed by changes around them. Construction of buildings is a major cause of tree injuries.
The purpose of this passage is to tell______.
选项 A、that people should know the importance of keeping trees healthy
B、that people should plant more trees
C、what trees can be used for construction of buildings
D、what kinds of trees look beautiful
答案A
解析 主旨大意题。本文首句“Healthy trees are important to us all．”即点出健康的树木对我们所有人都很重要，下面又分别讲解了人类可能会给树木带来伤害，呼吁人们要保持树木健康。故A项最符合文义。
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