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
A、They can use their claws as tools. B、They have straight beaks. C、Their claws are like human thumbs. D、Their beaks are short bu
A、They can use their claws as tools. B、They have straight beaks. C、Their claws are like human thumbs. D、Their beaks are short bu
admin
2020-11-04
28
问题
Hello, everybody. Today, I am going to talk about birds using tools.
Scientists have long known that a crow native to New Caledonia is able to use tools. The birds use them to remove food from deep inside holes and crevices. Now, American researchers have discovered a second species of crow that uses tools. Researchers with the San Diego Zoo reported on their experiments with Alala crows—a species from the Hawaiian Islands. There are no more Alala crows living in the wild. But there are some of the birds still living in a protected area in Hawaii. They are considered critically endangered. In an experiment, the researchers placed pieces of food in crevices inside a big piece of wood. The holes are too deep for the birds to reach with their beaks. But, by using small pieces of wood held in their beaks, the birds quickly found a way to get the food. The scientists said the crows demonstrated the ability to reach food in those cannot-reach-it places. The birds used small objects as tools, sometimes changing them by shortening a too-long stick. They also made tools from plant material. "Current evidence strongly suggests that tool use is part of the species’ natural behavioural pattern" , Rutz said.
Alalas are not the only intelligent crows to use tools. The other is the New Caledonian crow on New Caledonia Island in the Pacific Ocean. The New Caledonian crow can use tools to remove insects and other food from dead wood and plants.
How did crows learn to use tools? How did these birds learn to use tools? Scientists think their tool-using skills may have resulted, in part, from conditions in their Pacific island habitat. The two species have one more thing in common: unusually straight beaks. The birds use their beaks like the way people use thumbs on their hands.
All the Alala crows left in the world live in Hawaii. There were less than 20 Alalas left in the late 1990s when scientists decided to bring them into a protected area to increase their population. Now, there are over 100 birds living in captivity. The San Diego Zoo said its researchers tested almost all of them and "they determined that the vast majority of them spontaneously used tools. " Scientists are working to increase the population so that the Alala can be released back into the wild. They plan to release some of the birds back into the wild later this year.
Questions 23 to 25 are based on the recording you have just heard.
23. What does the speaker say about Alala crows?
24. What does Rutz say about the tool use of Alala crows?
25. What can we learn about the two species of crows?
选项
A、They can use their claws as tools.
B、They have straight beaks.
C、Their claws are like human thumbs.
D、Their beaks are short but hard.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/C3P7777K
0
大学英语六级
相关试题推荐
A、Hecompletelychangedthecompany’sculture.B、Hecollectedpaintingsbyworld-famousartists.C、Hetookoverthesalesdepar
A、Creatingjobsforthehugearmyofunemployedworkers.B、Providingtrainingandguidanceforunemployedworkers.C、Convincing
A、Biasedsourcesofinformation.B、Ignoranceofculturaldifferences.C、MisinterpretationofShakespeare.D、Tendencytojumpto
A、You’dbettersmileorlaughfromthebottomofyourheart.B、Youcan’tfoolyourbodybypretendingtobehappy.C、Asmartmi
在中国封建社会(feudalsociety),皇帝是最高统治者。秦王赢政统一中国之后,封自己为皇帝,他是中国首位皇帝。从此,中国开始了长达两千多年的专制制度。到1912年中国最后一位皇帝溥仪退位,中国历史上共有495位皇帝。皇帝是中国中央政权的突出代表,
Climatechangemaybereal,butit’sstillnoteasybeinggreenHowdoweconvinceourinnercavemantobegreener?Weasks
Let’sallstopjudgingpeoplewhotalktothemselves.Newresearchsaysthatthosewhocan’tseemtokeeptheirinnermonologues
A、Friday.B、Saturday.C、Sunday.D、Monday.B女士说,她周一时约Jennifer周六晚上出来约会。故答案是B。对话中只出现了Monday和Saturday,排除A和C。Monday是邀请的日期,Saturday是约会
A、Theygentlytouchthesurfaceofwater.B、Theybendtheirtonguestodrinkwater.C、Theyquicklyacceleratetheirtongues.D、T
A、Themassivegasunderground.B、Theirlackoftheneededskill.C、Theirlackofsuitabletools.D、Thesandunderthehill.D事实细
随机试题
简述公共关系的传播推广职责。
男性,46岁,有胃溃疡病史10年,近3个月上腹痛加重,食欲减退。间歇服用碱性抗酸药症状未能缓解而来住院。大便隐血阳性。黏膜活检,病理诊断为腺癌,体检未发现浅表淋巴结肿大,移动性浊音阴性,肛门指检未触及肿块,腹部B超肝无占位病变,胸部X线双肺无异常。应给
张某是甲期货公司的客户。甲期货公司因风险控制不力致使保证金出现缺口,申请使用期货投资者保障基金。张某保证金损失15万元。张某可能得到期货投资者保障基金补偿的最大金额为()万元。
在连续交易系统中,交易一定是连续的。()
根据钱德勒的结构跟随战略命题,与市场开发战略相匹配的组织结构是()。
根据国内信用证法律制度的规定,开证行收到受益人开户行寄交的委托收款凭证、单据等材料,并与信用证条款核对无误后,若发现开证申请人交存的保证金和存款账户余额不足以支付信用证金额的,开证行应采取的正确做法是()。(2013年)
【2014年四川成都.判断】教育心理学是研究人在教育过程中的心理现象及其发展变化规律的科学。()
给定资料1.“普惠金融”第一次正式写入党的决议,是在党的十八届三中全会。这一概念是由联合国在2005年正式提出来的。但其核心理念可追溯到15世纪罗马教会设立的当铺;到了20世纪70年代,现代意义上的小额信贷逐渐形成,尤其是孟加拉乡村银行的成功试验,掀起了
A、 B、 C、 D、 C第一组图形的交点数分别为1、3、5,第二组图形的交点数分别为3、5、(7),选项中只有C项的交点数为7。
甲欲杀死乙,向乙连砍数刀后,见乙倒地后没有再动,以为乙已死,遂逃离现场,乙被人及时抢救未死。甲的行为属于()。
最新回复
(
0
)