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
The sustained massive use of pesticides in farming has two effects that are especially pernicious. First, it often kills off the
The sustained massive use of pesticides in farming has two effects that are especially pernicious. First, it often kills off the
admin
2019-11-17
30
问题
The sustained massive use of pesticides in farming has two effects that are especially pernicious. First, it often kills off the pests’ natural enemies in the area. Second, it often unintentionally gives rise to insecticide-resistant pests, since those insects that survive a particular insecticide will be the ones most resistant to it, and they are the ones left to breed.
From the passage above, it can be properly inferred that the effectiveness of the sustained massive use of pesticides can be extended by doing which of the following, assuming that each is a realistic possibility?
选项
A、Using only chemically stable insecticides
B、Periodically switching the type of insecticide used
C、Gradually increasing the quantities of pesticides used
D、Leaving a few fields fallow every year
E、Breeding higher-yielding varieties of crop plants
答案
B
解析
Evaluation of a Plan
Situation Continued high-level pesticide use often kills off the targeted pests’ natural enemies. In addition, the pests that survive the application of the pesticide may become resistant to it, and these pesticide-resistant pests will continue breeding.
Reasoning What can be done to prolong the effectiveness of pesticide use? It can be inferred that the ongoing use of a particular pesticide will not continue to be effective against the future generations of pests with an inherent resistance to that pesticide. What would be effective against these future generations? If farmers periodically change the particular pesticide they use, then pests resistant to one kind of pesticide might be killed by another. This would continue, with pests being killed of in cycles as the pesticides are changed. It is also possible that this rotation might allow some of the pests’ natural enemies to survive, at least until the next cycle.
A Not enough information about chemically stable insecticides is given to make a sound inference.
B Correct. This statement properly identifies an action that could extend the effectiveness of pesticide use.
C Gradually increasing the amount of the pesticides being used will not help the situation since the pests are already resistant to it.
D Continued use of pesticides is assumed as part of the argument. Since pesticides would be unnecessary ror fallow fields, this suggestion is irrelevant.
E Breeding higher-yielding varieties of crops does nothing to extend the effectiveness of the use of pesticides.
The correct answer is B.
转载请注明原文地址:https://kaotiyun.com/show/hGkO777K
本试题收录于:
GMAT VERBAL题库GMAT分类
0
GMAT VERBAL
GMAT
相关试题推荐
Scientistssaidtheyhavefoundevidenceofagiantplanetfaroutinoursolarsystem.Inastatement,theCaliforniaInstitute
Scientistssaidtheyhavefoundevidenceofagiantplanetfaroutinoursolarsystem.Inastatement,theCaliforniaInstitute
Normallyastudentmustattendanumberofcoursesinordertograduate,andeachcoursewhichheattendsgiveshimagradewhic
Wehaveheardalotaboutthehealthbenefitsoftea,especiallygreentea.Itishighinpolyphenols,compoundswithstrongant
Iamafraidthathisphonenumberhasslippedmy______forthemoment.
Canyou______thedifferencesbetweenthetwopictures?
Ireadthenewspapereveryday______Icanstayinformedaboutcurrentevents.
MrObamawillgiveaspeechonthecurrentsituationatthemeeting_____nextweekinBeijing.
SpeakerA:So,what’sthestatusofouradvertisingcampaign?SpeakerB:AsImentionedbefore,it’llbeanationalcampaign
随机试题
如果甲国生产一只手表需要8个劳动日,生产一辆自行车需要9个劳动日,乙国生产手表和自行车分别需要13个和11个劳动日,根据比较优势学说,()。
患者,男,58岁。腰骶部疼痛1年余,医院检查发现蛋白尿3个月,辅查:血沉24mm/h,血红蛋白8.5g/dl,尿蛋白电泳显示以低分子蛋白为主,血CRE152μmol/L。最可能的诊断为
某商场(增值税一般纳税人)与其供货企业达成协议,与销售量挂钩进行平销返利。2008年5月向供货方购进商品取得税控增值税专用发票,注明价款120万元、税额20.40万元并通过主管税务机关认证,当月按平价全部销售,月末供货方向该商场支付返利4.8万元。下列该项
根据企业生产经营特点和管理要求,单步骤、大量生产的产品一般采用品种法计算产品成本。()
甲银行在某地新建分行的战略是,先主攻小额商贷业务在当地立足,再通过为小商户理财,扩大存款业务。王某是该行小额商贷部的一名主管,为实施新建分行的战略,首先抓住战略实施中的一个重要变量——市场细分,组织信贷员对市场进行细分和选择研究。因为他知道,只有在市场细分
现实冲击疗法最主要的特点是()。
市场经济运行的基本要求是()。
水利事业随着社会生产力的发展而不断发展,并成为人类社会文明和经济发展的重要支柱。下列有关我国古代水利工程的叙述,正确的一项是()。
A、Marginalizinghungerpeople.B、Isolatinghungerpeople.C、Mobilizingcommunities.D、Buildinglocalgovernment.C发动社区和建立本地机构对于维
在我国,()期货的当日结算价是该合约最后一小时成交价格按照成交量的加权平均价。
最新回复
(
0
)