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  3. In recent years a new farming revolution has begun, one that involves the 【C1】______ of life at a fundamental level—the gene. Th

In recent years a new farming revolution has begun, one that involves the 【C1】______ of life at a fundamental level—the gene. Th

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问题     In recent years a new farming revolution has begun, one that involves the 【C1】______ of life at a fundamental level—the gene. The study of genetics has【C2】______a new industry called biotechnology. As the name suggest, it【C3】______biology and modem technology through such techniques as genetic engineering. Some of the new biotech companies specialize in agriculture and are working feverishly to【C4】______seeds that give a high yield, that 【C5】______diseases, drought and frost, and that reduce the need for【C6】______chemicals. If such goals could be achieved, it would be most 【C7】______. But some have raised concerns about genetically engineered crops.
    In nature, genetic diversity is created within certain【C8】______. A rose can be crossed with a different kind of rose, but a rose will never cross with a potato. Genetic engineering, 【C9】______ usually involves taking genes from one species and inserting them into another【C10】______ to transfer a desired characteristic. This could mean, for example, selecting a gene which leads to the production of a chemical with anti-freeze【C11】______from an artic fish, and inserting it into a potato or strawberry to make it frost-resistant.【C12】______ , then, biotechnology allows humans to 【C13】______the genetic walls that separate species.
    Like the green revolution, 【C14】______some call the gene revolution contributes to the problem of genetic uniformity—some say even more so【C15】______ geneticists can employ techniques such as cloning and 【C16】______culture, processes that produce perfectly 【C17】______copies. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new【C18】______,such as the effects that they may have on us and the environment. "We are flying blindly into a new【C19】______of agricultural biotechnology with high hopes, few constraints, and little idea of the potential【C20】______," said science writer Jeremy Rifkin.
【C12】
选项 A、In essence
B、In part
C、In advance
D、In return
答案A
解析 考查逻辑关系及介词短语辨析。空格所在句是对前面内容的总结，前面具体讲了基因工程的特征，本句作为段尾句进一步做概括总结，因此，只有A．In essence“实质上”，自然地承接了上文。In part“部分地”，放在此处表达程度不够深，不能完全肯定基因工程；In advance“预先”，表示时间顺序，与本处语境不符；In return“作为报答”，不符合此处语义。故选A。
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