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  3. Trees Trees are the oldest living organisms on earth. / The great age of trees makes them useful for all sorts of scientific

Trees Trees are the oldest living organisms on earth. / The great age of trees makes them useful for all sorts of scientific

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答案 Trees Trees are the oldest living organisms on earth. / The great age of trees makes them useful for all sorts of scientific research. / Besides, trees also have a lot to teach us about being part of a community / and how cooperation is better for a society than competition. / A community of trees growing together / share all of the available resources with each other. / They do this through their roots, through the soil, / and also through the networks of tiny fungi growing in the soil between them. / They don’t only share with trees of the same species. / Any type of tree can benefit. / Trees grown in city conditions do not live as long as those growing in a natural environment, / maybe because they are more isolated. / According to people who work with trees, / a community with a good mixture of different species / is stronger and more resistant to insects and diseases. /
解析     树
   树是地球上最古老的生命体。古老的树木由于其可观的树龄而对各种科学研究均有帮助。此外，在关于成为群体的一部分以及合作与竞争相比是如何更有利于社群的这两个方面，树对我们也有很多启示。生长在一起的树群彼此分享所有可用的资源，他们通过根、土壤、以及生长在他们之间微小的真菌群来分享资源。他们不仅跟同品种的树分享。任何种类的树木都可以获益。
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