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
River Turtles Nesting habits The arrau turtle’s shell is approximately【L31】 ________ long. A female arrau deposits at least 【L32
River Turtles Nesting habits The arrau turtle’s shell is approximately【L31】 ________ long. A female arrau deposits at least 【L32
admin
2022-03-30
74
问题
River Turtles
Nesting habits
The arrau turtle’s shell is approximately【L31】 ________ long.
A female arrau deposits at least 【L32】________ every night.
River terrapins make a noise similar to【L33】 ________
Male river terrapins’ heads change【L34】 ________ in the breeding season.
Threats
Alexander von Humboldt estimated that【L35】 ________ jars of oil were produced at Rio Orinoco.
River terrapins used to be protected by a system of 【L36】________ for egg collectors.
River turtles are used in traditional 【L37】________ in Asia.
River turtles can reproduce for several【L38】 ________ if they are unharmed.
Farming as a solution?
Turtle farmers are encouraged not to sell turtles until they are 【L39】________
It is uncertain whether turtle farming will be successful in【L40】 ________ terms.
【L33】
Today on Nature Focus we’re looking at the river turtle and the threats it’s facing in today’s world. Two main places we see the giant river turtles are South America and South-east Asia. The best way to see the big rivers of South America, such as the Amazon and the Orinoco is probably by plane. But then you might miss the strange shallow craters that cover the sandbanks along these rivers. These are the nests of the arrau turtles, and at night thousands of turtles rise up out of the river water and scuttle into these holes. The holes are around ninety centimetres in diameter, so the turtles, whose shells are about
seventy-five centimetres in length,
fit neatly. Enormous numbers of eggs are laid on the beaches. Since hundreds of females, each laying
between seventy and eighty eggs,
crowd together it means that literally thousands of eggs fill the sandy nests, waiting to hatch.
A similar story is played out in Asia, where the river terrapins also lay their eggs communally and in the open. The difference is that the terrapins, once they have used the nests, cover them over and then beat the sand down with their limbs, making an amazing sound,
like drums.
The noise at night of many terrapins doing this is incredible, and drowns out the sound of the river water. And the male terrapins are fascinating too. Throughout the breeding season, they are famous for the
colour changes to their oddly-shaped heads
that take place.
However, these wonderful creatures are under threat, and this has been the case for quite some time. As long ago as 1811, the scientist and explorer Alexander von Humboldt was a witness to the mass destruction of turtle eggs at the Orinoco river. The eggs made oil and the oil made money. He recorded that, ’A jar contains twenty-five bottles of oil, each bottle being the production of two hundred eggs, and allowing for the wastage of eggs damaged in the nest, thirty-three million eggs had been harvested to fill
the five thousand jars’
— and that was a sight and a calculation that appalled him.
And it appalled many others too, so there have been, over the years, various initiatives designed to protect turtles and terrapins from such slaughter. For example, the Sultans of Perak in Asia ensured the safety, at least to some extent, of the beaches for terrapins when they
issued licences
to official egg collectors. These collectors would only collect eggs in numbers that were sustainable. However, the scheme, of course, vanished with the Sultans. And despite efforts at protecting turtles, there axe ever-growing demands for them, for pets in some countries, and as food in others and also heavily
in traditional medicine in various parts of Asia.
These levels of exploitation unfortunately far exceed their ability to reproduce and so replace their lost stock. It takes a turtle a long time — many years — to grow from a baby, or hatchling, to an adult that can reproduce, and so the survival of eggs and hatchlings is crucial to the survival of the species. But the threat never stops being acute. Once adult, a female turtle can continue
reproducing for a number of decades,
provided they are not killed or injured, so the loss of even a single adult can mean many years of reproduction are lost forever.
Is it all gloom? Well, there are some grounds for cautious optimism. There are some well thought out management systems in place which can help the stocks of threatened turtles and terrapins to rebuild. In Brazil, for example, the government has been encouraging and supporting the farming of river turtles, with the idea that this happens alongside the banning of the hunting of wild turtles. The idea Of the scheme is to provide farmers with a one-off batch of hatchlings, which they are urged to keep until
they become mature.
This should mean that good quantities of turtles capable of reproducing come to the rescue of the species. Will it work? Let’s hope so. The scheme has its doubters, who point out that, while the biology arguments for the scheme certainly do make sense, the farmers on the scheme, of course, have no experience of this kind of farming. That means it’s impossible at this stage to know if the turtles they develop will be sufficiently marketable, and thus if the scheme will work well
from an economic point of view.
It may be that it has to rely on subsidies, and that would mean, in the long term, that it would probably fail. But it’s certainly worth a try, and I hope to be back on this programme in a few years’ time, reporting on its great success.
选项
答案
drums
解析
水龟(terrapins)能发出一种像鼓(drums)的声音,录音中的like和题目处的be similar to为同义替换,表示“像,相似”。
转载请注明原文地址:https://www.kaotiyun.com/show/el8O777K
本试题收录于:
雅思听力题库雅思(IELTS)分类
0
雅思听力
雅思(IELTS)
相关试题推荐
Youshouldspendabout20minutesonQuestions1-13whicharebasedonReadingPassage1below.IMPLEMENTINGTH
Youshouldspendabout20minutesonQuestions1-13whicharebasedonReadingPassage1below.IMPLEMENTINGTH
Lookatthethreerestaurantadvertisementsonthefollowingpage.Answerthequestionsbelowbywritingthelettersoftheappr
Lookatthefollowingstatements(Questions34-40)andthelistofcountriesbelow.Matcheachstatementwiththecorrectcountry.
Lookatthefollowingstatements(Questions34-40)andthelistofcountriesbelow.Matcheachstatementwiththecorrectcountry.
Whattypeofgardenplantscanbenefitbirdsandinsects?
ChooseTWOletters,A-E.Writethecorrectlettersinboxes21and22onyouranswersheetWhichTWOofthefollowingbenefitsa
Completethenotesbelow.WriteNOMORETHANTHREEWORDSforeachanswer.PersonalityQuestionnairescom
RiverTurtlesNestinghabitsThearrauturtle’sshellisapproximately【L31】________long.Afemalearraudepositsatleast【L32
随机试题
梅奥认为,正是________造成了广泛的无力感和随之而生的社会解体。
本国人员到外国就医,这种服务贸易属于()
影响住院病人舒适的环境因素包括
申请甲级环境影响评价机构应具备( )名以上环境影响评价专职技术人员,其中至少有( )名登记于该机构的环境影响评价工程师,其他人员应当取得环境影响评价岗位证书。
建设行政主管部门会同有关部门在收到工程监理企业年检资料后( )日内,对工程监理企业资质年检作出结论,并记录在《工程监理企业资质证书》副本的年检记录栏内。
()被认为是公司的无成本融资来源。
我国加入WTO以来,由于外资和民营企业的大举进入,我国汽车产业快速进入了过剩时代。同时由于价格下降和能源、原材料价格上涨,使得中国的汽车产业从“暴利”时代快速进入了“微利”时代。在这种趋势下,汽车产品的竞争在很大程度上将表现为价格的竞争。目前我国汽车产业的
Whenasearchengineguesseswhatyouwantbeforeyoufinishtypingit,orhelpfullyignoresyourbadspelling,thatistheresu
PASSAGETHREEWhatdoestheword"pinch"inthe5thparagraphmean?
Nearly5,000peoplebelowtheageof21diebecauseofexcessivealcoholconsumptioneachyear.Oddly,thishastriggeredanew
最新回复
(
0
)