首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In recent years a new farming revolution has begun, one that involves the【C1】______of life at a fundamental level--the gene. The
In recent years a new farming revolution has begun, one that involves the【C1】______of life at a fundamental level--the gene. The
admin
2012-12-13
59
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 modern 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 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 a production of a chemical with anti-freeze【C11】______from an arctic 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 (培养), 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.
【C9】
选项
A、after all
B、on the other
C、in any case hand
D、at a rest
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/O3w7777K
0
大学英语四级
相关试题推荐
Thepopularnotionthatolderpeopleneedlesssleepthanyoungeradultsisamyth,scientistssaidyesterday.Whileelderly
Thepopularnotionthatolderpeopleneedlesssleepthanyoungeradultsisamyth,scientistssaidyesterday.Whileelderly
BritishCuisine:theBestofOldandNewBritishcuisine(烹饪)hascomeofageinrecentyearsaschefs(厨师)combinethebest
BritishCuisine:theBestofOldandNewBritishcuisine(烹饪)hascomeofageinrecentyearsaschefs(厨师)combinethebest
BritishCuisine:theBestofOldandNewBritishcuisine(烹饪)hascomeofageinrecentyearsaschefs(厨师)combinethebest
BritishCuisine:theBestofOldandNewBritishcuisine(烹饪)hascomeofageinrecentyearsaschefs(厨师)combinethebest
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
随机试题
A.瘾疹风寒束表证B.瘾疹风热犯表证C.瘾疹胃肠湿热证D.瘾疹血虚风燥证E.以上均不是
反映企业最大分派现金股利能力的财务指标是()。
中国公民李某为某外资公司的高级职员,2009年的收入情况如下:(1)单位每月支付工资、薪金10000元;(2)当年12月底,单位和李某协商,解除劳动合同,单位除支付当月工资外,另外一次支付李某补偿金20万元(李某在该单位任职5年);
(2017年济宁汶上)古代教育的一般组织形式足()
学生知识主要来源于()。
()在业主集体自治管理组织分工体系中居于首要地位。
属于南京国民政府制定的宪法或者宪法性文件有()。
材料人民民主专政是我国的国体。我国宪法明确规定:“中华人民共和国是工人阶级领导的、以工农联盟为基础的人民民主专政的社会主义国家。”这一规定表明:人民民主专政是工人阶级(经过共产党)领导的、以工农联盟为基础的、对人民实行民主和对敌人实行专政的国家政
IEEE802.11b定义了使用跳频技术的无线局域网标准,它的最高传输速率可以达到______Mbps。
BaruchSpinozawasaDutchphilosopherandreligiousthinkerwhowasbornonNovember24,1632inAmsterdam.HisfamilywasSpan
最新回复
(
0
)