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  3. Every second,【56】hectare of the world’s rainforest is destroyed. That’s one to two football fields. This【57】rate of destruct

Every second,【56】hectare of the world’s rainforest is destroyed. That’s one to two football fields. This【57】rate of destruct

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问题     Every second,【56】hectare of the world’s rainforest is destroyed. That’s one to two football fields.
    This【57】rate of destruction has serious consequences【58】the environment. Scientists estimate, for example, that 137【59】of plant, insect or animal become【60】every day due to logging. In British Columbia,
    【61】,since 1990,thirteen rainforest valleys have been clear cut,142 species of salmon have already become extinct, and the【62】of grizzly bears, wolves and many other creatures are threatened. Logging,
    【63】,provides jobs , profits, taxes for the government and cheap products of all kinds for consumers, so the government is【64】to restrict or control it. Much of Canada’s forestry production【65】making pulp and paper. According to the Canadian Pulp and Paper Association, Canada【66】34%of the world’s wood pulp and 49% of its newsprint paper. If these paper products could be produced in some other way, Canadian forests could be【67】. Recently, a possible【68】way of producing paper has been suggested by agriculturalists and environmentalists: a plant called hemp. Hemp has been cultivated by many cultures for thousands of years. It produces fibre which can be【69】paper, fuel, oils, textiles, food, and rope. For many centuries, it was essential to the economies of many countries【70】it was used to make the ropes and cables used on sailing ships; colonial expansion and the establishment of a world-wide trading【71】would not have been possible【72】hemp. Nowadays, ships’ cables are usually made from wire or synthetic fibres, but scientists are now suggesting that the cultivation of hemp should be【73】for the production of paper and pulp. According to its proponents, four-times as【74】paper can be produced from land using hemp rather than trees, and many environmentalists believe that the【75】scale cultivation of hemp could reduce the pressure on Canada’s forests.
选项 A、types
B、categories
C、species
D、classes
答案C
解析 本题考核的知识点是：of结构+名词辨析。of结构考查修饰关系。四个词都有“种类，类型”的意思。type指一种类型，如：Cotton is a type of material．棉花是一种材料。category侧重在一大系统中将各种物质进行划分，如：There are different categories of books in a library．图书馆里有各种不同种类的书籍。species专门指(植物或动物的)种，如 Some species of animals have become extinct because they could not adapt to a changing environment．有一些动物已经灭种了，因为它们不能适应环境的变化。class侧重按照质量、等级进行划分，如top class student一流的学生。文中指的是植物、动物的种类，因此C为答案。
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