2. 考研
  3. In recent years a new farming revolution has begun, one that involves the【B1】______of life at a fundamental level—the gene. The

In recent years a new farming revolution has begun, one that involves the【B1】______of life at a fundamental level—the gene. The

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问题     In recent years a new farming revolution has begun, one that involves the【B1】______of life at a fundamental level—the gene. The study of genetics has 【B2】______ a new industry called biotechnology. As the name suggest, it【B3】______biology and modem technology through such techniques as genetic engineering. Some of the new biotech companies specialize in agriculture and are working feverishly to 【B4】______ seeds that give a high yield, that 【B5】______ diseases, drought and frost, and that reduce the need for 【B6】______ chemicals. If such goals could be achieved, it would be most【B7】______. But some have raised concerns about genetically engineered crops.
    In nature, genetic diversity is created within certain 【B8】______. A rose can be crossed with a different kind of rose, but a rose will never cross with a potato. Genetic engineering, 【B9】______ usually involves taking genes from one species and inserting them into another【B10】______to transfer a desired characteristic. This could mean, for example, selecting a gene which leads to the production of a chemical with anti-freeze 【B11】______ from an artic fish, and inserting it into a potato or strawberry to make it frost-resistant.【B12】______, then, biotechnology allows humans to【B13】______the genetic walls that separate species.
    Like the green revolution,【B14】______some call the gene revolution contributes to the problem of genetic uniformity—some say even more so【B15】______geneticists can employ techniques such as cloning and 【B16】______ culture, processes that produce perfectly【B17】______copies. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new【B18】______,such as the effects that they may have on us and the environment. "We are flying blindly into a new【B19】______of agricultural biotechnology with high hopes, few constraints, and little idea of the potential【B20】______," said science writer Jeremy Rifkin.
【B13】
选项 A、brake
B、blaze
C、breach
D、brand
答案C
解析 考查动词辨析。空格处所填动词与wall搭配，四个选项中能与wall搭配的只有C．breach“破坏．打破”，用在此处表示生物工艺学打破了隔在物种之间的基因障碍。blaze“着火，发光”，是不及物动词，不能与wall搭配：brake“刹车”，与wall不搭配；brand“铭记，铭刻”，语义与搭配均不正确。故选C。
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