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
69
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.
【L38】
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
decades
解析
录音中提到假设一只成年的雌性乌龟没有受到杀害,它可以继续再生产长达几十年之久;此处录音中的a number of与not killed or injured分别和题目中的several与unharmed为同义替换。
转载请注明原文地址:https://kaotiyun.com/show/cl8O777K
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
GOODREASONSFORCHOOSINGATLASENGLISHLANGUAGECOLLEGEOnanEnglishcoursewithAtlasEnglishLanguageColleg
Readthepassageaboutpersonalcomputersonthefollowingpageandlookatthestatementsbelow(Questions14-20).Inboxes14
Lookatthethreerestaurantadvertisementsonthefollowingpage.Answerthequestionsbelowbywritingthelettersoftheappr
Whattypeofgardenplantscanbenefitbirdsandinsects?
NewZealandSeaweedCallusnotweeds;weareflowersofthesea.SectionASeaweedisaparticularlynutritiousfood,whichabs
About60%ofpeoplewhouseonlinenetworkingsitesareconcernedthattheirpersonaldetailsmaybeaccessibletopeopletheyd
Atthestartofthetutorial,thetutoremphasisestheimportanceofThetutorsaysthatfindingoutpersonalinformationis
Completethenotesbelow.WriteNOMORETHANTHREEWORDSforeachanswer.PersonalityQuestionnairescom
Choosethecorrectletter,A,BorC.Whencanpatientsmeetthefemaledoctor?
RiverTurtlesNestinghabitsThearrauturtle’sshellisapproximately【L31】________long.Afemalearraudepositsatleast【L32
随机试题
原告A先生与被告B女士为夫妻,他们在甲国缔结了一项合同,这项合同约定他们在乙国进行离婚诉讼时,双方如何分担责任,如规定丈夫不承担对孩子的监护义务等。审理本案的乙国法官认为:“当一个国家的法院被请求执行在另一个国家缔结的合同时,问题不仅仅在于该合同按照同缔结
该患者最可能的诊断是血清C,水平有鉴别诊断意义,该患者的血清C,水平是
Ⅳ型高脂蛋白血症是指空腹血浆中
下列不是肿瘤的原因的是
A.疏散肺经风热B.透达肝经郁热C.辛凉散邪利咽D.清利头目利咽E.辛凉解表疏肝薄荷在养阴清肺汤中的作用是()
贝利:罗纳尔多:巴西
设A,B相互独立,P(A)=0.7,P(A∪B)=0.88。求P(A-B)。
邓小平指出:“一个党,一个国家,一个民族,如果一切从本本出发,思想僵化,迷信盛行,那它就不能前进,它的生机就停止了,就要亡党亡国。”这段话突出强调了
Readthetextbelowaboutjobadvertisement.Inmostofthelines(41-52)thereisoneextraword.Itiseithergrammaticallyin
A、Theymustpayoffthetuitionfortheireducation.B、Theymusthavethemilitarytraining.C、Theymusttakepartincollegeco
最新回复
(
0
)