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  3. In recent years a new farming revolution has begun, one that involves the【1】of life at a fundamental level-the gene. The study o

In recent years a new farming revolution has begun, one that involves the【1】of life at a fundamental level-the gene. The study o

admin2011-02-25  64
问题     In recent years a new farming revolution has begun, one that involves the【1】of life at a fundamental level-the gene. The study of genetics has【2】a new industry called biotechnology. As the name suggests, it【3】biology and modern technology through such techniques as genetic engineering. Some of the new biotech companies specialize in agriculture and are working feverishly to【4】seeds that give a high yield, that【5】disease, drought and frost, and that reduce the need for【6】chemicals. If such goals could be achieved, it would be most【7】. But some have raised concerns about genetically engineered crops.
    In nature, genetic diversity is created within certain【8】. A rose can be crossed with a different kind of rose, but a rose will never cross with a potato. Genetic engineering【9】usually involves taking genes from one species and inserting them into another【10】to transfer a desired characteristic. This could mean, for example, selecting a gene which leads to the production of a chemical with anti-freeze【11】from an arctic fish, and inserting it into a potato or strawberry to make it frost-resistant.【12】, then, biotechnology allows humans to【13】the genetic walls that separate species.Like the green revolution,【14】some call the gene revolution contributes to the problem of genetic uniformity-some say even more【15】geneticists can employ techniques such as cloning and【16】culture, processes that produce perfectly【17】copies. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new【18】, such as the effect they may have on us and environment. ".We are flying blindly into a new【19】of agricultural biotechnology with high hopes, few constraints and little idea of the potential【20】," said science writer Jemery Rifkin.
选项 A、In essence
B、In part
C、In advance
D、In return
答案A
解析 考查上下文的理解。in essence意为“实际上，大体上”；inpart意为“部分地”；in advance意为“预先”；in return意为“作为报答”。上文中提到，这意味着从一条北极鱼体内提取可以形成具有抵御霜冻特性的化学物质的基因，然后植入一个土豆或者草莓中，使得它们也可以抵御霜冻；本句话说，生物技术可让人类打破分隔物种的遗传障碍，说明本句话说的是实际的情况，故选项A正确。
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