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
21
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.
【33】
选项
A、brake
B、blaze
C、breach
D、brand
答案
C
解析
根据文意,只有C项breach“违反,违犯,打破”符合上下文的逻辑关系。其他三项均不符合文章所要表达的意思。
转载请注明原文地址:https://kaotiyun.com/show/eMDd777K
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
ThespeakerthinksthattobeateacherismoredifficultthantobethepresidentoftheNEA.Thespeakerwantstochangethe
HowhavetheoncereasonablypricedholidaysinEuropebecometoAmericans?EconomistBivenssaystheBushadministrationtalks
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.Mobilehousesarebui
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.Peopleformcooperati
FamilyrelationshavechangedinrecentyearsinChina,aswehavemoreandmoreone-childfamilies.Theonlychildinthefamil
Whenamagazineforhigh-schoolstudentsaskeditsreaderswhatlifewouldbelikeintwentyyears,theysaid:machineswouldbe
Whenamagazineforhigh-schoolstudentsaskeditsreaderswhatlifewouldbelikeintwentyyears,theysaid:machineswouldbe
WhatisCathyfedupwith?______onpackingcases
Australia
随机试题
前、后方视野测量规定,轮胎花纹深度至少为_________%。
低合金高强度结构钢的牌号表示方法及意义是怎样的?
对子宫描述错误的是()
A.肾前性急性肾损伤B.急性肾小管坏死C.急性间质性肾炎D.急进性肾小球肾炎E.肾后性急性肾损伤肝硬化伴大量腹水,进行性尿量减少1周,尿比重1.030。尿红细胞(-),蛋白(-)。少尿最可能的原因是
患者,2天前晨起突然出现呕吐清水痰涎,脘闷不食,头眩心悸,舌苔白滑,脉滑。诊为
桁架结构的优点是( )。
科目编码一般用()来表示。
职工李某因工作腿部受损,治疗终结后安装了假肢。治疗期间,李某一并治疗了困扰其多年的鼻炎疾病。李某应当享受的工伤医疗待遇包括()。
下列叙述错误的是()。
FiveMythsaboutCollegeDebt[A]Thetrillion-dollarstudentdebtburdenhascausedmanydebatesaboutthevalueofcollege.
最新回复
(
0
)