2. 外语
  3. In recent years a new farming revolution has begun, one that involves the 【21】______ of life at a fundamental level—the gene.

In recent years a new farming revolution has begun, one that involves the 【21】______ of life at a fundamental level—the gene.

admin2010-07-06  44
问题      In recent years a new farming revolution has begun, one that involves the  【21】______   of life at a fundamental level—the gene. The study of genetics has  【22】______   a new industry called biotechnology. As the name suggest, it  【23】______   biology and modem technology through such techniques as genetic engineering. Some of the new biotech companies specialize in agriculture and are working feverishly to  【24】______   seeds that give a high yield, that  【25】______   diseases, drought and frost, and that reduce the need for  【26】______   chemicals. If such goals could be achieved, it would be most  【27】______   . But some have raised concerns about genetically engineered crops.
     In nature, genetic diversity is created within certain  【28】______   . A rose can be crossed with a different kind of rose, but a rose will never cross with a potato. Genetic engineering,  【29】______   usually involves taking genes from one species and inserting them into another  【30】______   to transfer a desired Characteristic. This could mean, for example, selecting a gene which leads to the production of a chemical with antifreeze  【31】______   from an artic fish, and inserting it into a potato or strawberry to make it frost-resistant.  【32】______   , then, biotechnology allows humans to  【33】______   the genetic walls that separate species.
     Like the green revolution,  【34】______   some call the gene revolution contributes to the problem of genetic uniformity—some say even more so  【35】______   geneticists can employ techniques such as cloning and  【36】______   culture(培养), processes that produce perfectly  【37】______   copies. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new  【38】______   , such as the effects that they may have on us and the environment. "We are flying blindly into a  【39】______   of agricultural biotechnology with high hopes, few constraints, and little idea of the potential  【40】______   ," said science writer Jeremy Rifkin.
【30】
选项 A、to the point
B、in no case
C、in an attempt
D、with regard
答案C
解析 attempt to“试图做某事，完成某事”本题采取试填法，只有C项符合句子的逻辑关系。in no case“无论如何都不”；with regard 常用with regard to sb／sth“关于某人，有关某事”。
转载请注明原文地址:https://kaotiyun.com/show/aMDd777K
本试题收录于： 公共英语四级笔试题库公共英语（PETS）分类
0

公共英语四级笔试

公共英语（PETS）

相关试题推荐
随机试题
最新回复(0)