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 【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.
admin
2010-07-06
48
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.
【38】
选项
A、issues
B、height
C、difficulties
D、goals
答案
A
解析
根据上下文的意思这里应当是引出新的issue“问题,话题”。其他三项代入后,均不符合句子的上下文所要表达的意思。
转载请注明原文地址:https://kaotiyun.com/show/cMDd777K
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
ThepagesoftheHarvardBusinessReviewarenotusuallypopulatedbynovelists.ButJosephFinderisjustsuchararity.Recent
ThepagesoftheHarvardBusinessReviewarenotusuallypopulatedbynovelists.ButJosephFinderisjustsuchararity.Recent
Whatisthefirstjobthemanappliedforrightafterhisuniversitygraduation?Tourismcanbeapositiveforceifitis______
WhatcanbesaidaboutthereportbytheNationalAcademyofSciences?Whathinderstheextensiveuseofrenewableenergysourc
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.
FamilyrelationshavechangedinrecentyearsinChina,aswehavemoreandmoreone-childfamilies.Theonlychildinthefamil
Whenamagazineforhigh-schoolstudentsaskeditsreaderswhatlifewouldbelikeintwentyyears,theysaid:machineswouldbe
【61】Womenmakeup40percentoftheworld’sworkforceinagriculture,aquarterinindustry,andathirdinservices.Womenfa
Weholdsthesetruthstobeselfevidentthat______.
WhatisCathyfedupwith?______onpackingcases
随机试题
小张最近工作压力大,睡觉的时候经常做噩梦。这种噩梦属于()
社会主义由空想变为科学的标志性著作是
我国的项目管理的应用是从()领域的探索开始的。
根据《建设工程项目管理规范》,项目经理的权限包括()。
以下说法不是领导者的角色的是()。
水稻的雌配子致死可导致稻穗出现空粒,严重影响水稻的产量。研究表明,水稻配子的成活率由两对独立遗传的等位基因(分别用A/a和B/b表示)控制,F1基因型为ab的雌雄配子均致死。据此分析,基因型为aaBB和AAbb的水稻植株杂交得到F1,F1自交后所结的稻穗中
肯定德国在国际关系中的大国地位的法律文件是()。
关于守法的表述,不能够成立的是( )。
数据的逻辑独立性是指
【S1】【S4】
最新回复
(
0
)