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试题答案:
决策树的优点是非常直观,也容易理解。缺点是当可选的策略较多,或有较复杂的组合时,并不容易清楚地表达出判断的过程,也难于保证判断策略的完备性。
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第二部分: 阅读选择(第11~15题,每题2分,共10分)阅读下面短文,请从短文后所给各题的4个选项(A、B、C、D)中选出 1个最佳选项,并在答题卡相应位置上将该项涂黑。Urban Gardening Urban gardening refers to the practice of planting agarden in the city.Apartments,town homes,andother areas with lttle or no landare being used for gardening.This method of ardening is becoming more common as the amount of land for gardening incities is becoming smaller and smaller. Containers,hanging baskets and raised beds are examples of items people use to create a garden in a confined space.Some cities also offer a shared community garden for people who have no room to grow plants at home. Many types of plants can be grown in containers and baskets.Tomatoes andpeppers,for instance,can grow in containers on windowsills(窗台).Plants grown on a windowsill should usually receive at least six to eight hours of sunlight daily.Herbs are often grown in containers or baskets in the kitchen.They do not require much space and can be handy for cooking. People who want to grow more plants may use raised beds which are usually made of wood pieces and flled with a mixture of soil and fertilizers.They can be built on top of any hard surface,including roof tops.People like them because the beds often cost much less than most other methods of gardening. Community gardening could be an option for anyone who does not have spacefor a garden at home.Most cities that offer this will rent a small plot of'land to someone for a fee,or allow them to use it free of charge.Instead of dividing the land into separate plots,some cities allow everyone inthe neighborhood to share andwork on the same land.This method could be beneficial for people in the neighborhood who share the passion for growing things.
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