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
26
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.
【26】
选项
A、hostile
B、hydraulic
C、hazardous
D、harmless
答案
A
解析
空格处的上文一直在说这种基因工程的优点,由此推出这里肯定是:能够减少对有毒化学药品的需要。hostile“敌意的,有害的”;hazardous“危险的,冒险的”,一般指危险的工作情况;harmless“无害的”。
转载请注明原文地址:https://jikaoti.com/ti/s1isFFFM
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.Thereisabiggapbetweenthee
WhatishappeninginAustralia’sagriculturalindustry?
DoesthepublisherofDouglasStarr’sexcellentBlood—AnEpicHistoryofMedicineandCommerceactuallyexpecttosellmanycopi
DoesthepublisherofDouglasStarr’sexcellentBlood—AnEpicHistoryofMedicineandCommerceactuallyexpecttosellmanycopi
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.Inmanyareasofthe
NewfiguresfromFrance,GermanyandItaly--thethreebiggesteconomiesinthe12-countryEurozone-suggestthecontinent’sec
Amultinationalcorporationisacorporateenterprise,whichthoughheadquarteredinonecountry,conductsitsoperationsthrou
WhatisCathyfedupwith?______onpackingcases
Australia.
Australia
随机试题
请分析行政组织纵向结构的优缺点。
简述需要与动机的关系。
不是低镕点铅的成分的是
对病毒无效的消毒剂为
男性,68岁,间断咳嗽、咯血20年,痰量较多,呈脓性,有时带血。近半年来心慌,双下肢水肿。心电图检查:P波在Ⅱ、Ⅲ、aVF高尖,≥2.5mm,QRS波V1、V2呈QS型,电轴右倾。诊断最可能是
中药品种对质量的影响不容忽视,一药多基原的情况普遍存在,来源于同属2个种以上的中药是()。
外资企业所得税税率实行30%的比例税率,另按应纳税所得额征收3%的()。
物料搬运必须遵循的一个基本原则是()。
某人驾驶一辆小轿车要做32000千米的长途旅行,除了车上装着四只轮胎,只带了一只备用胎。为了使五只轮胎磨损程度相同,司机有规律地把五只轮胎轮换使用。到达终点时,每只轮胎行驶了多少千米?
当前微机上运行的Windows属于()。
最新回复
(
0
)