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
25
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.
【C15】
选项
A、that
B、because
C、if
D、when
答案
A
解析
转载请注明原文地址:https://jikaoti.com/ti/jDPFFFFM
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
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
随机试题
【B1】【B4】
颌面外科病房中有多位需要换药的病人,应遵循的换药顺序是
《中国药典》规定细辛的入药部位为()。
(2010年多项选择第46题)乙公司欲购甲公司生产的一种电动自行车,双方达成购买协议,并将样品封存,且对样品质量作了说明。关于电动自行车质量的说法,正确的是()。
下列非营利组织取得的收入中,免于征收企业所得税的有()。
贝尔一兰卡斯特制又被称为()。
在()阶段,个体开始认识自己和别人的异同,认识现在和未来在社会中的关联,有了明确的自我观念和自我追求的方向。
依法治国
Ourstudents’educationalachievementsequal,andinmanycases______thoseofstudentsinpreviousyears.
自从1978年市场化改革(marketreforms)以来,中国经济已经逐渐从集中的计划经济向市场经济转变,中国经济和社会发展迅速。
最新回复
(
0
)