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
Trawling (用拖网捕鱼) the seabed for fish is an environmental disaster; it wrecks ecosystems, destroys fish stocks and leaves behind
Trawling (用拖网捕鱼) the seabed for fish is an environmental disaster; it wrecks ecosystems, destroys fish stocks and leaves behind
admin
2017-11-08
18
问题
Trawling (用拖网捕鱼) the seabed for fish is an environmental disaster; it wrecks ecosystems, destroys fish stocks and leaves behind a marine desert. Right? Environment campaigners say so. But there is growing evidence that the effect is sometimes very different, with trawling increasing fish stocks from the North Sea to the California coast. A new modeling study may for the first time have demonstrated why.
Trawlers attach large nets to a metal beam dragged across the seabed to catch bottom-dwelling fish. Greenpeace compares it to "driving a huge bulldozer through a forest", leaving a flat, featureless desert on the seabed. Trawling clearly does remove fish, such as large crustaceans and shellfish, says Daniel van Denderen of the Wageningen Institute for Marine Resources and Ecosystem Studies in the Netherlands. But this is a lucky break for softer, smaller species lurking in the sandy seabed, such as worms. They survive and, with fewer rivals, flourish.
And if, as is often the case, these smaller critters are the main food for fish, then the overall effect is to nurture more marine life. Imants Priede, director of Oceanlab at the University of Aberdeen, UK, says there is growing evidence that—while far from universal—the phenomenon is real. "On continental shelves such as the southern North Sea, where shifting sands and gravels are stirred up by strong tidal currents, even trawling more than once a year may be beneficial for some fish stocks," he says.
In fact, studies going back 20 years have linked persistent trawling with increased fish stocks. The cause of this counter-intuitive finding has remained uncertain. Some have suggested that trawling stirs up the seabed, throwing potential food into the water column—rather like ploughing a field. Others think that discards from fish nets add to the food available on the sea floor. But van Denderen is the first to show how trawling can stimulate fisheries simply by drifting from ecosystems. "The findings are very important," says Priede.
Which of the following is the best title for the passage?
选项
A、Trawling is good for fish stocks.
B、Trawling reduces fish stocks.
C、Whether trawling is beneficial for fish stocks increasing
D、Trawling needs to be advocated.
答案
C
解析
文章对trawling和fish stocks的关系进行了探讨,指出trawling虽然对海床造成破坏,捕捞了一些大型的甲壳类水生动物,但是小型的水生动物生存下来并大量繁殖,所以在一定程度上也有利于鱼类增加。但文章最后一段明确指出这种关系并不明确。所以本题答案为C。
转载请注明原文地址:https://jikaoti.com/ti/N8UFFFFM
0
大学英语四级
相关试题推荐
Designingforsustainability:whatarethechallengesbehindgreenmaterials?A)LearningtosurfinCalifornia’sicybreakers,T
Designingforsustainability:whatarethechallengesbehindgreenmaterials?A)LearningtosurfinCalifornia’sicybreakers,T
Designingforsustainability:whatarethechallengesbehindgreenmaterials?A)LearningtosurfinCalifornia’sicybreakers,T
A、Naturaldisasters.B、Largechemicalfactories.C、Exhaustfromvehicles.D、Largeamountsofhouseholdgarbage.B男士说汽车尾气给环境造成很大的
Theownershipofpetsbringsavarietyofbenefitsthattheuninitiatedwouldneverbelieve.Foreverytaleofshreddedcushion,
Acidrain,whichisaformofairpollution,currentlybecomesasubjectofgreatdebatebecauseofwidespreadenvironmentaldam
TheEskimoshavedevelopedacapacitytolivepeacefullywithoneanother.Theyhavenothadastrictsystemoflandownership,o
A、Marketswherebirdslikeparrotsaresold.B、Zooswheretherearenoexpertstomanagethebirds.C、Ownerswhocannothandlet
随机试题
A.单体酶B.寡聚酶C.结合酶D.多功能酶由于基因融合,形成由一条多肽链组成却具有多种不同催化功能的酶是
患者,男,40岁。行血栓闭塞性脉管炎术后,为了解反映肢体远端血运情况,护士应观察的体征不包括()。
干筛法、水筛法的适用范围。
根据《环境影响评价技术导则一地下水环境》,某I类建设项目拟建在某温泉保护区内,污水排放量为100m3/d,污水水质简单,该项目评价工作等级为()。
无粘结预应力筋外包层材料严禁使用()。
【资料】某餐饮企业2015年11月经营业务如下:(1)取得现场消费餐饮营业收入200万元,其中包括利用啤酒生产设备生产的啤酒收入10万元;(2)取得熟食外卖收入50万元;(3)内设卡拉0K厅取得收入5万元,其中包
【材料1】毛泽东同志毕生最突出最伟大的贡献,就是领导我们党和人民找到了新民主主义革命的正确道路,完成了反帝反封建的任务,建立了中华人民共和国,确立了社会主义基本制度,并从中国实际出发探索社会主义建设的道路,为古老的中国赶上时代发展潮流、阔步走向繁荣昌盛创造
竹子清丽俊逸、挺拔凌云的姿质令风流名士们沉醉痴迷,_____________。世界上最早的一部植物专谱——戴凯之的《竹谱》正是在这种风气下以韵文的形式诞生的。①对竹啸吟终日不辍者亦有之②一时间,闻有好竹即远涉造访而不通名姓者有之③这一时期,文人雅士赋
简析义和团的“扶清灭洋”口号。
初诊的目标就是通过获取以下哪项资料,并与患者进行交流协商,共同制订出全面、合理、符合原则的治疗方案()。
最新回复
(
0
)