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  3. Across the United States, scientists are mounting what may become the most i

Across the United States, scientists are mounting what may become the most i

游客2023-09-13  68
问题     Across the United States, scientists are mounting what may become the most innovative agricultural research drive since the 1920’s, when hybrid corn was developed. Surprisingly, the new genetic revolution is not taking place in America’s fields. Instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes of crop plants. This genetic engineering may prove the biggest boon to agriculture since plant breeding began.
    The new concepts grew out of the bioengineering of bacteria for the production of such things as human hormones and vaccines for viral diseases. Plant cells, however, are far more complex than bacteria, and it will probably take many years for today’s encouraging laboratory results to have a major impact on the farm. In fact the payoff may not come until the next century.
    But although bio-technologists are still in the earliest phases of this new field of science, they are already actively exploring ways to redesign plants so they will use sunlight mere efficiently, resist viruses and other pests, grow in hot or dry areas, in saline soils or in the presence of pesticides, and perhaps even make their own fertilizer out of nitrogen in the air. In addition, scientists have had early success in making wholly new plants that are unavailable by conventional plant breeding-a potato-tomato combination, for example.
    The new technology holds the promise of virtually limitless horizons in food production. Only imagination sets the limits: frost-resistant wheat, tropical potatoes, saltwater rice, a plant producing a combination of a pea and a carrot-all may be with us one day. [br] The overall effect of this passage is likely to make the reader feel ______.
选项 A、enthusiastic about biotechnology
B、very worry about genetic engineering
C、reluctant to try new plant combinations
D、alarmed about limitless experiment
答案 A
解析 该题问及作者的写作目的，也是作者对生物工程技术应用于农业所持的态度。从文章中一些感情色彩浓厚的词可窥见作者的意图。如“the most innovative agricultural research，the biggest boon，encouraging laboratory results，payoff，holds the promise of virtually limitless horizons”等等都传递了一个共同的信息，农业基因工程新技术的发展令人鼓舞，故作者的目的在于使读者热衷于生物技术。选项B“对基因工程感到非常担心”，选项C“不愿尝试新的植物杂交术”，和选项D“对无止境的实验感到惊恐，均不是作者想在读者心中产生的效果。
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