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
13
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.
Why does Greenpeace compare trawling to "driving a huge bulldozer through a forest"?
选项
A、Because trawling will make seabed become a desert.
B、Because trawling will make the forest become a flat and featureless area.
C、Because trawling is a huge bulldozer, which will destroy the forest.
D、Because trawling catches bottom-dwelling fish.
答案
A
解析
根据题干可以将该句定位至文章第二段。第二段第二句说Greenpeace compares it to“driving a huge bulldozer through a forest”,leaving a flat,featureless desert on the seabed。Greenpeace之所以把trawling比作“开着庞大的推土机穿过森林”是因为推土机破坏了森林的植被,而trawling让海床变成了海漠。因此答案为A选项。
转载请注明原文地址:https://kaotiyun.com/show/X2a7777K
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
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,
A、Valuableprintstakenfromtheship.B、Asuitcasefilledwithdonatedclothes.C、Herlifesavingsackinthedisaster.D、Apolog
A、Drivinglicense.B、Trainingcourse.C、Cookingskills.D、Australianpassport.B细节题。“Holtsaidthewinnerwouldbeentitledtoa
Acidrain,whichisaformofairpollution,currentlybecomesasubjectofgreatdebatebecauseofwidespreadenvironmentaldam
A、AskhisfriendstosellFriedChicken.B、Workasacookinafamousrestaurant.C、Sellhischickenrecipetorestaurantowners
A、Hewasoutforbusiness.B、Hewashavingatrip.C、Hewasstillworking.D、Hewascookingseafood.B录音一开始女士就问男士五一在干什么,她打了好几次电话
随机试题
某国某年的有关经济指标分别为:国际收支的经常账户逆差360亿美元,资本账户顺差290亿美元;年底的未清偿还外债余额为474亿美元,其中短期外债占70%;国民生产总值3950亿美元。根据以上材料,回答下列问题:该国外债结构管理的重点应该是()。
下列哪种肺炎最易合并肺脓肿
与CT图像显示上下位置偏移有关的操作是
水泥混凝土路面纵向施工缝应设()。
一般地,在投资决策过程中,投资者应选择()行业投资。
在当今世界许多地区民族冲突迭起的情况下,我国各族人民和睦相处,共同建设有中国特色的社会主义,这是因为()。
投射效应:指在认知和对他人形成印象时,以为他人也具备与自己相似的特性的现象,即推己及人的情形。下列不属于投射效应的是( )。
VPN是虚拟专用网的简称,主要类型可分为网络层的IPSecVPN和应用层的(17)VPN两种,其中IPSecVPN主要是为了解决(18)的互联。
为了使一个窗体从屏幕消失但仍在内存中,所使用的方法或语句为______。
この会社は独裁的な社長一人の意見で働いていると言えない____。
最新回复
(
0
)