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高处作业模拟考试题库-6

高处作业模拟考试题库-6

高处作业模拟考试题库-6判断题1、 工作绳是工作时承担人体及携带物重量的长绳。

正确答案:正确2、 G133869-1997规定III级或者III级下体力劳动强度可以作业。

正确答案:错误3、 在距离高度基准面3m或3m以上有可能坠落层高处作业。

正确答案:错误4、 移动式挂梯踏板间距不小于400mm。

正确答案:错误5、 移动式挂梯长度不宜超过6m。

正确答案:正确6、 附着式升降脚手架,它的荷载传递路径为:架体构架-水平支承桁架-竖向框架-附着支承结构-工程结构. 正确答案:正确7、 移动式操作平台(车)具有独立的构架,不可以搬移,可以运输货物,装修工程和水电安装。

正确答案:正确8、 剪刀式高空作业平台(车)有电瓶、柴油发动机两种方式。

正确答案:正确9、 吊篮的电源线应有保护措施,固定在设备上,防止短路、断路。

正确答案:正确10、 工作前必须检查配电箱、导线、提升机、制动装置、安全锁是否安全可靠。

正确答案:正确11、 吊篮上电源箱应能防水、防尘和防震,箱门可不加锁。

正确答案:错误12、 吊板作业时,横向移动的最大距离,为以作业者为中心左右不大于20cm。

正确答案:错误13、 作业时,一旦发生自锁器失效,应坚持把工作做完,再更换自锁器。

正确答案:错误14、 外墙清洗作业人员在作业过程中,应当正确佩带和使用劳动防护用品。

正确答案:正确15、 目前常用的吊具有座板式单人吊具和电动吊篮两种。

正确答案:正确16、 建筑物表面清洗作业人员年龄必须达到年满18周岁。

正确答案:正确正确答案:正确18、 ZLD500型电动吊篮平台尺寸为2m。

正确答案:错误19、 ZLD800型电动吊篮提升机的电动机功率为1.1KW。

正确答案:错误20、 座板式单人作业现场区域应保证四周环境的安全,其作业下方应设警戒线并有人看守。

正确答案:正确21、 作业前必须先系好悬挂绳,安全吊绳。

正确答案:正确22、 外墙清洗作业时应佩戴安全帽,使用安全带,可不用人监护,由一人作业。

测试技术-中南大学网络教育学院网上作业模拟练习题

测试技术-中南大学网络教育学院网上作业模拟练习题

(一) 单选题1. 不失真测试条件中,要求幅频特性为( )。

(A) 线性(B) 常数(C) 是频率的函数参考答案:(B)2. 瞬变信号,其频谱,则表示( )。

(A) 信号的一个频率分量的能量(B) 信号沿频率轴的能量分布密度(C) 信号的瞬时功率(D) 信号的频率参考答案:(B)3. 两个函数,把运算式称为这两个函数的( )。

(A) 自相关函数(B) 互相关函数(C) 卷积(D) 矢量积参考答案:(C)4. 连续非周期信号的频谱是( )。

(A) 离散、周期的(B) 离散、非周期的(C) 连续非周期的(D) 连续、周期的参考答案:(C)5. 用常系数微分方程描述的系统称为( )系统。

(A) 相似(B) 物理(C) 力学(D) 线性参考答案:(D)6. 复杂周期信号的频谱是( )。

(A) 离散的(B) 连续的(C) 函数(D) 函数参考答案:(A)7. 测试装置能检测输入信号的最小变化能力,称为( )。

(A) 精度(B) 灵敏度(C) 精密度(D) 分辨率参考答案:(D)8. 下列函数表达式中,( )是周期信号。

(A)(B)(C)(D)参考答案:(B)9. 下列微分方程中( )是线性系统的数学模型。

(A)(B)(C)参考答案:(B)10. 测试过程中,量值随时间而变化的量称为( )。

(A) 准静态量(B) 随机变量(C) 动态量(D) 不变量参考答案:(C)11. 不能用确定函数关系描述的信号是( )。

(A) 复杂周期信号(B) 瞬变信号(C) 随机信号(D) 正弦信号参考答案:(C)12. 对某二阶系统输入周期信号,则其输出信号将保持( )。

(A) 幅值不变,频率、相位改变(B) 相位不变,幅值、频率改变(C) 频率不变,幅值、相位改变参考答案:(C)13. 测试装置的脉冲响应函数与它的频率响应函数间的关系是( )。

(A) 卷积(B) 傅氏变换对(C) 拉氏变换对(D) 微分参考答案:(B)14. 数字信号的特征是( )。

熔化焊接与热切割作业模拟考试100题及答案

熔化焊接与热切割作业模拟考试100题及答案

熔化焊接与热切割作业摹拟考试 100 题及答案1、 (判断题) 《安全生产法》的核心内容不包括五方运行机制。

错误2、 (判断题)氩弧焊引弧所用的高频振荡器会产生一定强度的电磁辐射,接触较多的焊工,会引起头晕、疲惫无力、心悸等症状。

正确3、 (判断题)在拉拽触电者脱离电源的过程中,救护人应双手迅速将触电者拉离电源。

错误4、 (判断题)当自然接地电阻超过4Ω时,应采用人工接地极。

正确5、 (判断题)冲击吸收功和冲击韧度的单位均为焦耳。

错误6、 (判断题)由于危(wei)险源的存在,生产安全事故发生的可能,使得对生产进行安全管理就显得可有可无。

错误7、 (判断题)高处作业存在的主要危(wei)险是个人防护。

错误8、 (判断题)当电石桶或者乙炔发生器内电石发生燃烧时,可用水灭火。

错误9、 (判断题)化学性爆炸,是由于物质在极短期内完成的化学变化,形成其他物质,同时放出大量热量温和体的现象。

正确10、 (判断题)火柴和打火机的火焰属于明火。

正确11、 (判断题)中频电会使焊工产生一定的麻电现象,这在高处作业时是很危(wei)险的。

错误12、 (判断题)气体保护焊时,氢气只能与氧气混合,不能与其他气体混合,否则特殊容易浮现危(wei)险。

错误13、 (判断题)蒸气锅炉爆炸是一种化学爆炸。

错误14、(判断题)电石属于遇水燃烧危(wei)险品。

正确15、 (判断题)端接接头仅在厚板焊接时采用。

错误16、 (判断题)普通根据工件材料选择电流种类。

正确17、 (判断题)手工电弧堆焊单层堆焊的最小厚度是 3.2mm。

正确18、 (判断题)使用 Ar- H2 混合气体作离子气时,由于电弧温度较高,应降低喷嘴孔径的额定电流。

正确19、 (判断题)堆焊在多数情况下,具有异种金属焊接的特点。

正确20、 (判断题)带压不置换焊割,要严格控制含氧量,使可燃气体的浓度大大超过爆炸上限。

正确21、 (判断题)压力焊与钎焊的金属结合机理彻底相同。

特种作业模拟考试试题

特种作业模拟考试试题

特种作业模拟考试试题一、选择题1. 《特种设备安全法》规定,对特种设备安全监督管理的主管部门是:A. 国家安全生产监督管理总局B. 国家质量监督检验检疫总局C. 国家标准化管理委员会D. 国家工程建设标准化技术委员会2. 以下哪种特种作业需取得特种设备作业人员操作资格证书?A. 员工定期进行的电器设备维护B. 叉车司机操作C. 机动作业的操作人员D. 作业在架空线路上进行3. 下列哪种情况是进行特种设备作业前的必要准备?A. 未经操作培训,且无有效证书B. 未查看设备使用说明和操作规程C. 未进行视觉检查和功能性测试D. 未携带所需的操作工具4. 在进行高处作业时,下列哪种情况可能导致安全事故?A. 使用合格的防护设备B. 不擅自更改安全设备的固定方式C. 超越工作台的额定承重量D. 合理规划高处护栏和警示标语5. 以下关于特种设备安全操作的说法,哪项是正确的?A. 不带声光警示器的特种设备不得操作B. 检查后确认特种设备功能正常方可操作C. 未进行防爆设备检查前无需佩戴防爆设备D. 未查看设备工作情况可忽略事故风险二、判断题6. 特种设备作业人员进行作业前,需佩戴与证书颜色相符的前胸挂证牌,以示证明。

是(√)否(×)7. 基础明确,正确使用设备和仪器,遵章守纪,共同维护设备安全和事故预防是特种设备作业人员的共同责任。

是(√)否(×)8. 特种设备作业人员应定期接受操作技能与安全生产教育培训,通过考核方可持证上岗操作。

是(√)否(×)9. 进入特种设备作业现场应检查,确认安全标识、操作规程和现场通风状况,避免因操作不当而引发安全事故。

是(√)否(×)10. 特种设备作业人员需保持维修设备前的手部清洁,并穿着工作服,以避免油污和异物污染工具或设备。

是(√)否(×)三、简答题11. 请简要说明特种设备作业中为何需要严格按照操作规程和作业程序进行操作?12. 高温、高压、高空、低温等状况对于特种设备作业人员有怎样的影响?该如何防范?13. 在进行特种设备作业之前,哪些准备工作是必不可少的?请列举并简要说明。

高空作业模拟试题及答案

高空作业模拟试题及答案

高空作业模拟试题及答案一、选择题(每题2分,共20分)1. 高空作业的定义是什么?A. 指在地面以上2米及以上的作业B. 指在地面以上1米及以上的作业C. 指在地面以上3米及以上的作业D. 指在地面以上5米及以上的作业答案:A2. 高空作业人员必须配备哪些防护装备?A. 安全帽和安全带B. 安全帽和防护眼镜C. 安全帽和手套D. 安全帽和防护面罩答案:A3. 在进行高空作业时,以下哪项措施是错误的?A. 确保作业平台稳固B. 确保作业人员身体状况良好C. 作业人员可以随意攀爬D. 遵守高空作业安全规程答案:C4. 高空作业时,以下哪种行为是安全的?A. 作业人员在没有安全带的情况下作业B. 作业人员在饮酒后进行作业C. 作业人员在作业期间保持警惕D. 作业人员在作业期间使用手机答案:C5. 高空作业的安全检查包括哪些内容?A. 作业人员健康状况B. 作业环境检查C. 作业工具检查D. 所有以上选项答案:D6. 高空作业时,以下哪项不是作业人员的责任?A. 检查作业工具是否完好B. 确保作业环境安全C. 监督其他作业人员的安全D. 作业人员不需要了解作业规程答案:D7. 高空作业中,以下哪种情况不需要立即停止作业?A. 发现作业平台有损坏B. 发现作业人员身体不适C. 遇到恶劣天气D. 作业人员未佩戴安全带答案:A8. 高空作业时,以下哪种行为是正确的?A. 作业人员可以携带重物上下楼梯B. 作业人员可以站在不稳定的物体上C. 作业人员应使用合适的工具进行作业D. 作业人员可以不使用安全带答案:C9. 高空作业完成后,以下哪项工作是不必要的?A. 清理作业现场B. 检查作业工具是否完好C. 立即离开作业现场D. 记录作业情况答案:C10. 高空作业中,以下哪种情况应立即报告?A. 作业人员感到疲劳B. 作业人员感到饥饿C. 发现作业环境有安全隐患D. 作业人员需要上厕所答案:C二、判断题(每题1分,共10分)1. 高空作业人员在作业前不需要进行安全教育。

法理学-中南大学网络教育学院网上作业模拟练习题

法理学-中南大学网络教育学院网上作业模拟练习题
(D)相互冲突的法律原则可以共存于一部法律之中
参考答案:
(C)
3.法的本质是()。
(A)维护社会稳定的工具
(B)维护和巩固国家政权的手段
(C)统治阶级实现阶级统治的工具
(D)规范人们行为的规则
参考答案:
(C)
4.根据我国法律的规定,适用法律认定和归结法律责任时不遵循以下哪一项原则?()
(A)责任法定原则
(B)公正原则
(C)效益原则
(D)保护主义原则
参考答案:
(D)
5.在阶级对立的社会中,法的本质属性首先是指()
(A)法的客观性
(B)法的阶级性
(C)法的规范性
(D)法的强制性
参考答案:
(B)
6.根据马克思主义法学的根本观点,下列表述哪一项是正确的?()
(A)法在本质上是社会成员公共意志的体现
(B)法既执行政治职能,也执行社会公共职能
(C)法最终决定于历史传统、风俗习惯、国家结构、国际环境等条件
(D)法不受客观规律的影响
参考答案:
(B)
7.下列选项中,不属于法律规则构成要素的是哪一项?()
(A)假定
(B)行为模式
(C)法律后果
(D)概念
参考答案:
(D)
8.下列有关法律部门与规范性法律文件的关系表述,不正确的是哪一项?()
(A)一个规范性法律文件就是一个部门法
(C)公民具有权利能力,并不必然具有行为能力
(D)权利能力也包括公民承担义务的能力或资格
参考答案:
(B)
10.下列有关公法与私法的表述,哪些是不正确的?()
(A)公法与私法的划分,最早是由古罗马法学家提出的
(B)按照乌尔比安的解释,公法是以保护国家利益为目的的法律,私法是以保护私人利益为目的的法律

高危作业模拟题试题及答案

高危作业模拟题试题及答案

高危作业模拟题试题及答案当作业许可证的正本和副本已分发后,如果情况有变化,可以进行修改。

[判断题]对错(正确答案)申请人是填写作业许可证,并向批准人提出工作申请的作业单位现场负责人 [判断题]对(正确答案)错工作安全分析是一种通过事先或定期对某项工作任务进行风险评价,并根据评价结果制定和实施相应的控制措施,达到最大限度消除或控制风险目的的工作方法 [判断题]对(正确答案)错动火作业、受限空间作业、管线打开、起重吊装作业、高处作业、临时用电、动土作业等需办理专项作业许可证; [判断题]对(正确答案)错申请人应实地参与作业许可证所涵盖的工作,否则作业许可证不能得到批准 [判断题]对(正确答案)错当作业许可证涉及到多个负责人时,则被涉及到的负责人均应列在申请表内。

[判断题]对(正确答案)错安全作业许可证由经被作业部门审核,不用属地部门负责人批准签发后也可作业。

[判断题]对错(正确答案)工作安全分析的内容应包括工作步骤、存在的风险及危害程度、相应的控制措施等。

[判断题]对(正确答案)错工作安全分析是编制安全施工方案的基础 [判断题]对(正确答案)错许可证审批之前,对凡是可能存在缺氧、富氧、有毒有害气体、易燃易爆气体、粉尘的作业环境,都应进行气体检测,确认合格。

同时在安全工作方案中注明工作期间的气体检测时间和频次 [判断题]对(正确答案)错许可证的作业期限不能超过小时 [单选题]A.100B.120(正确答案)C.150D.200作业完成后应及时清理作业现场,通知相关部门撤出警戒标识,并及时向主管部门汇报作业完毕。

[判断题]对(正确答案)错作业监护人因有其他重要工作,可暂时离开。

[判断题]对错(正确答案)防范措施应告知所有作业人员,并按办法穿戴和使用防护用品。

[判断题]对(正确答案)错作业区域应有明确的警戒标识 [判断题]对(正确答案)错严格遵守作业的起止时间,如超时可在作业票上更改延长作业时间。

2020特种作业模拟考试练习题及答案-安全管理人员

2020特种作业模拟考试练习题及答案-安全管理人员

2020特种作业模拟考试练习题及答案--安全管理人员安全管理人员(危险化学品作业)1、制造压力容器受压元件的材料要求具有较好的塑性。

【正确答案:对】2、《气瓶安全监察规程》规定,气瓶必须专用。

只允许充装与钢印标记一致的介质,不得改装使用。

【正确答案:对】3、可靠的水循环是锅炉安全监督的一个重要内容。

【正确答案:对4、堆放各种爆炸品时,要求做到牢固、稳妥、整齐,防止倒垛,便于运输。

【正确答案:对】5、决定爆炸品敏感度的内在因素是它的化学组成和结构,影响敏感度的外来因素还有温度、杂质、结晶、密度等。

【正确答案:对】6、硫的磷化物,不仅具有遇火受热的易燃性,而且还具有遇湿易燃性。

【正确答案:对】7、危险、有害因素指可能导致伤害、疾病、财产损失、环境破坏的根源或状态。

【正确答案:对】8、在工业生产中,有毒品侵入人体的主要途径是呼吸道、消化道和皮肤。

【正确答案:对】9、一般来讲,物质越易燃,其火灾危险性就越小。

【正确答案:错】10、MLD叫最小致死剂量,是指毒物毒性导致个别实验动物死亡的最低剂量。

【正确答案:对】11、装卸、搬运危险化学品时应做到轻装、轻卸。

严禁摔、碰、撞击、拖拉、倾倒和滚动。

【正确答案:对】12、爆炸品不包括以爆炸物质为原料制成的成品。

【正确答案:错】13、严禁将有毒品与食品或食品添加剂混储混运。

【正确答案:对】14、电伤是电能转换成热能、机械能等其他形式的能量作用于人体,对人体造成的伤害。

【正确答案:对】15、静电的消失主要有两种方式即中和和泄漏。

【正确答案:对】16、室颤电流即最小致命电流,与电流持续时间关系密切。

【正确答案:对】17、静电事故多发生在潮湿的季节。

【正确答案:错】18、根据《危险化学品安全管理条例》,负有危险化学品安全监督管理职责的部门依法进行监督检查,监督检查人员不得少于3人,并应当出示执法证件。

【正确答案:错】19、将易制毒化学品许可证或者备案证明转借他人使用的;负有监督管理职责的行政主管部门吊销相应的许可证。

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Questions 1-3:This book may not change your life. But if you have a tendency to be messy and have already broken your new year resolutions to be neater in future, it will certainly make you feel better about your natural inclinations. Untidiness, hoarding, procrastination and improvisation are not bad habits, the authors argue, but often more sensible than meticulous planning, storage and purging of possessions.That is because the tidiness lobby counts the benefits of neatness, but not its costs. A rough storage system (important papers close to the keyboard, the rest distributed in loosely related piles on every flat surface) takes very little time to manage. Filing every bit of paper in a precise category, with colour-coded index tabs and a neat system of cross-referencing, will certainly take longer. And by the end, it may not save any time. Your reviewer's office is easily the most untidy in The Economist (not entirely his own work, it should be said, thanks to the heroic efforts of his even untidier office-mate). But when it comes to managing information, there seems to be no discernible difference in the end result.The authors of this book trawl the furthest reaches of psychology, management studies, biology and physics to show why a bit of disorder is good for you. Chiefly, it creates much more room for coincidence and serendipity. Alexander Fleming discovered penicillin because he was notoriously untidy, and didn't clean a Petri dish, thus allowing fungal spores to get to work on bacteria. He remarked wryly on visiting a colleague's spotless lab: “no danger of mould here”.It can also help make sense of things. Hearing depends on random movement of molecules: when they coincide with sounds from outside, they are strong enough to stimulate the inner ear. A bit of background noise on the phone enables our ears to filter out echoes. A slightly mushyphotograph can be easier to understand. Music and art depend on mess.Procrastination makes sense too. America's Marine Corps, the authors repeat (several times), never makes detailed plans in advance. Leaving important things to the last minute reduces the risk of wasting time on things that may ultimately prove not important at all.The authors are witheringly contemptuous of the bogus equation of tidiness and morality—for example in corporate “clean desk” policies. Disorder and creativity are so closely linked that any employer who penalizes the first sacrifices the second, they argue. America's professional organizers, a thriving and lucrative cult of tidiness coaches, are merchants of guilt, not productivity boosters.It's all fine, up to a point. But the book has two weaknesses. One is that it overstates the case. The case for tidiness in some environments—surgery, a dinner table or income tax returns—is really overwhelming. The other is that the book is a bit repetitive and disorganized.Even readers who love mess in their own lives don't necessarily like it in others.1. Paraphrase the sentence “the tidiness lobby counts the benefits of neatness, but not its costs”. (Para. 2)2. Why did the authors of the book cite the example of Alexander Fleming in the third paragraph?3. What is the “equation of tidiness and morality”? (Para. 6) Why are the authors of the book “contemptuous of” it?Questions 4-6:"We changed South Korean politics and the media market, but I'm too shy to say that,” says Oh Yeon Ho before he can catch his own irony. But Mr. Oh, the founder and boss of Ohmy News, a sort of online newspaper, has earned the right to boast, because Ohmy is the world'smost successful example to date of “citizen journalism” in action. Ohmy's website currently gets an average of 700,000 visitors and 2m page views a day,which puts it in the same league as a large newspaper. But Ohmy has no reporters on its staff at all. Instead, it relies on amateurs—“citizens”, as Mr. Oh prefers to call them—to contribute the articles, which are then edited by Mr Oh, a former magazine journalist, and a few colleagues. Mr.Oh likes to think of Ohmy as a “playground” for South Korean hobbyists, where “adults” set certain rules and thus give the site credibility. The articles tend to be good, because “in South Korea we have good people power,” says Mr. Oh. “They are highly educated and eager to change society.” Ohmy also has built-in feedback and rating systems so that the best articles rise to the top.One of Ohmy's biggest innovations is economic. The site has a “tipjar” system that invites readers to reward good work with small donations. All they have to do is click a little tip-jar button to have theirmobile-phone or credit-card account debited. One particularly good article produced the equivalent of $30,000 in just five days. Ohmy's own economics also appear to be working well. Even though Mr. Oh originally intended the company to be not-for-profit—“my aim was not to earn money but to create a new kind of journalism,” he says—he turned it into a for-profit firm in 2003. He will not divulge how much profit he makes, but the advertising and syndication revenues (from other internet sites that run Ohmy's articles) seem to keep him going nicely.Ohmy's success has already had wide ramifications in South Korea's media industry. Although it has not killed off any South Korean newspapers or broadcasters, it has forced all of them to adjust by becoming more like Ohmy. Several newspaper sites, for instance, now have feedback and conversation panes at the bottom of online articles and are trying to interact more with readers. Mr. Oh, who left his careerin the mainstream media because he was sick of what he saw as their conservative bias, also reckons that Ohmy has helped to improve the balance. If the media scales used to be tilted 80% in favor of conservatives, he thinks, Ohmy has reduced that to 60%; he wants to make it 50%.Does South Korea, a country of early adopters in many ways, foreshadow the future everywhere? “The reality is that you can't point to many successes; Ohmy News is the only one,” says Dan Gillmor, a journalist who quit his job at the San Jose Mercury News, a newspaper widely read in Silicon Valley, in order to found Grassroots Media, an experiment in American citizen journalism. After a year or so of looking in vain for a good business model, Mr Gillmor has put the idea on ice.But others are much more optimistic. Last year Al Gore, a former American vice-president, and Joel Hyatt, his friend and business partner, set up Current TV, a cable-television channel that encourages its viewers to contribute their own video stories. And they do. “Viewer-created content”—or “VC2”,as Current TV calls it—now accounts for 30% of the channel's airtime, and rising. Mr Hyatt, the chief executive, thinks it will eventually be half or more. To help people get started, Current TV has extensive online tutorials on storytelling techniques, camera equipment and so forth. And to organize the content that comes in, its website allows users to vote on the quality of each video clip. It is, in many ways, a pure meritocracy.When Current TV was launched, the traditional cable channels “didn't get it” and sneered, Mr Hyatt recalls with glee. “What people didn't understand is that there are tens of thousands of people out there who can create something great for a few minutes.” For instance, a story by an American traveler who found himself in the Gaza Strip during Israel's pull-out was probably the best piece of video reporting on the subjectthat ran on television at the time. During Hurricane Katrina, some residents of New Orleans made excellent contributions by taking cameras onto their home-made boats and making videos of their own neighborhoods.For society as a whole, all this new talent—from bloggers, who are “journal-ists” in the classic sense, to citizen journalists—should amount to something overwhelmingly positive. “The more journalism the better;I don't care who does it,” says Dan Gillmor. That is not, however, how professional journalists, ostensibly speaking on behalf of the public, usually choose to see it. Their mood is gloomy.4. What is Ohmy? How did it “change South Korean media market”?5. How does the Current TV differentiate itself from traditional TV channels? Give some examples.6. Explain the last sentence of the article “their mood is gloomy”. Questions 7-10:“You don't have to wait for government to move... the really fantastic thing about Fairtrade is that you can go shopping!” So said a representative of the Fairtrade movement in a British newspaper this year. Similarly Marion Nestle, a nutritionist at New York University, argues that “when you choose organics, you are voting for a planet with fewer pesticides, richer soil and cleaner water supplies.”The idea that shopping is the new politics is certainly seductive. Never mind the ballot box: vote with your supermarket trolley instead. Elections occur relatively rarely, but you probably go shopping several times a month, providing yourself with lots of opportunities to express your opinions. If you are worried about the environment, you might buy organic food; if you want to help poor farmers, you can do your bit by buying Fairtrade products; or you can express a dislike of evil multinational companies and rampant globalization by buying only localproduce. And the best bit is that shopping, unlike voting, is fun; so you can do good and enjoy yourself at the same time.Sadly, it's not that easy. There are good reasons to doubt the claims made about three of the most popular varieties of “ethical” food: organic food, Fairtrade food and local food. People who want to make the world a better place cannot do so by shifting their shopping habits: transforming the planet requires duller disciplines, like politics.Organic food, which is grown without man-made pesticides and fertilizers, is generally assumed to be more environmentally friendly than conventional intensive farming, which is heavily reliant on chemical inputs. But it all depends what you mean by “environmentally friendly”. Farming is inherently bad for the environment: since humans took it up around 11,000 years ago, the result has been deforestation on a massive scale. But following the “green revolution” of the 1960s greater use of chemical fertilizer has tripled grain yields with very little increase in the area of land under cultivation. Organic methods, which rely on crop rotation, manure and compost in place of fertilizer, are far less intensive. So producing the world's current agricultural output organically would require several times as much land as is currently cultivated. There wouldn't be much room left for the rainforest.Fairtrade food is designed to raise poor farmers' incomes. It is sold at a higher price than ordinary food, with a subsidy passed back to the farmer. But prices of agricultural commodities are low because of overproduction. By propping up the price, the Fairtrade system encourages farmers to produce more of these commodities rather than diversifying into other crops and so depresses prices—thus achieving, for most farmers, exactly the opposite of what the initiative is intended to do. And since only a small fraction of the mark-up on Fairtrade foods actually goes to the farmer—most goes to the retailer—the system gives richconsumers an inflated impression of their largesse and makes alleviating poverty seem too easy.Surely the case for local food, produced as close as possible to the consumer in order to minimize “food miles” and, by extension, carbon emissions, is clear? Surprisingly, it is not. A study of Britain's food system found that nearly half of food-vehicle miles (i.e., miles traveled by vehicles carrying food) were driven by cars going to and from the shops. Most people live closer to a supermarket than a farmer's market, so more local food could mean more food-vehicle miles. Moving food around in big, carefully packed lorries, as supermarkets do, may in fact be the most efficient way to transport the stuff.What's more, once the energy used in production as well as transport is taken into account, local food may turn out to be even less green. Producing lamb in New Zealand and shipping it to Britain uses less energy than producing British lamb, because farming in New Zealand is less energy-intensive. And the local-food movement's aims, of course, contradict those of the Fairtrade movement, by discouraging rich country consumers from buying poor-country produce. But since the local-food movement looks suspiciously like old-fashioned protectionism masquerading as concern for the environment, helping poor countries is presumably not the point.The best thing about the spread of the ethical-food movement is that it offers grounds for hope. It sends a signal that there is an enormous appetite for change and widespread frustration that governments are not doing enough to preserve the environment, reform world trade or encourage development. Which suggests that, if politicians put these options on the political menu, people might support them. The idea of changing the world by voting with your trolley may be beguiling. But if consumers really want to make a difference, it is at the ballot box thatthey need to vote.7. Paraphrase the sentence “Never mind the ballot box: vote with your supermarket trolley instead”. ( Para. 2)8. What is “organic food”? Why does the author believe that it may lead to the problem that “there wouldn’t be much room left for the rainforest”?9. How is “Fairtrade food” designed to help poor farmers? According to the author, can this goal be achieved?10. How is the “local food” generally believed to help protect the environment? Why does the author say that “local food may turn out to be even less green”? (Para. 7)。

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