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  3. Each day every person in the United States throws away more than five pounds of garbage(垃圾). There is more garbage now than ever

Each day every person in the United States throws away more than five pounds of garbage(垃圾). There is more garbage now than ever

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问题     Each day every person in the United States throws away more than five pounds of garbage(垃圾). There is more garbage now than ever before and most of it is made up of the packages and cans in which we put our food. The traditional way of getting rid of solid wastes is quickly becoming inadequate. Many cities are experimenting with newer ways of handling their growing piles of garbage.
    One of these new ways is "recycling"(回收使用). Through recycling usable materials are taken out of garbage and made into something else. These usable parts of garbage are put through the cycle of going from a raw material to a finished product again.
    In some cities a machine called Hydrapulper is being used to help recycle garbage. A Hydrapulper is like a huge mixing machine. The garbage is dropped onto a conveyor belt (传送带) that feeds the machine. At the same time, water is pumped into the Hydrapulper. With a mixing action, the Hydrapulper throws out the heavy metal objects that can later be sold as waste metal. The rest of the garbage—paper, food, plastic, rubber, glass, wood, leaves, and other items—falls apart. The waste is then mixed with water and carried to another piece of equipment where glass, sand and small pieces of metal are thrown out.
    With the Hydrapulper, up to 95 percent of the original garbage is made again useful. The rest turns into furnace ash(炉灰).
What is the main purpose of this passage?
选项 A、To describe an experiment in which a Hydrapulper is used.
B、To introduce Hydrapulper, a new type of garbage disposer.
C、To tell what the writer thinks of the recycling of garbage.
D、To explain why garbage should be recycled in a new way.
答案B
解析 本题为主旨归纳题。文章第一段指出垃圾成山引起许多城市进行垃圾处理新方法试验。第二段作者开始介绍一种新的机械，介绍这种新的机械是如何工作的，它是如何将垃圾中无用的部分和有用的部分分开的。
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