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 use their nails as tools. B、They use their tongues as tools. C、They are born to use tools. D、They are trained to use tool
A、They use their nails as tools. B、They use their tongues as tools. C、They are born to use tools. D、They are trained to use tool
admin
2020-11-04
34
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 use their nails as tools.
B、They use their tongues as tools.
C、They are born to use tools.
D、They are trained to use tools.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/33P7777K
0
大学英语六级
相关试题推荐
A、Cognitivestimulation.B、Communityactivity.C、Balanceddiet.D、Freshair.A讲座中提到,以前的一些研究表明,通过一些精神刺激活动来挑战大脑可能会有助于减少认知衰退,Burke表
A、Theybestboostproductsaleswhenputonline.B、TheyaremosteffectivewhenappearingonTV.C、Theyarebecomingmoreandmo
A、Theytrytochangepeople’ssocialbehavior.B、Theyhelpenhancethewell-beingoftheunderprivileged.C、Theyraisepeople’s
Cansocietiesberichandgreen?[A]"Ifoureconomiesaretoflourish,ifglobalpovertyistobeeliminatedandifthewell-bei
Climatechangemaybereal,butit’sstillnoteasybeinggreenHowdoweconvinceourinnercavemantobegreener?Weasks
Travelwebsiteshavebeenaroundsincethe1990s,whenExpedia,Travelocity,andotherholidaybookingsiteswerelaunched,allo
A、Fewpopularitemscanbefoundinstores.B、Theyarenotexcitingnewarrivalsanymore.C、Youmaycompletelyforgettheproduc
A、Theirrelationshipswiththeprofessors.B、Theirfinancialaidpackages.C、Theirlightschoolload.D、Theirrichextracurricul
A、Aplatewithwater.B、Aplatewithfood.C、Adirtyplate.D、Acleanplate.D选项均涉及盘子,预测题目应该跟餐饮有关。讲座最后聊到餐饮习俗:与埃及和中国不同,美国人认为你把盘里的
A、Itisstained.B、Itisstrained.C、Itisstinky.D、Itisstale.A选项都是主系表结构的句子,且表语都是形容词,可猜测题目与某物的性质或特征有关。根据对话,皮衣袖子上有污点,所以男子没有兴趣
随机试题
设X1,X2,X3,X4是来自总体X的样本,已知总体X—N(0,1),则()。
下列不属于建设项目施工招标的投标文件内容的是()。
根据水泥混凝土拌和物的()经试拌确定最佳拌和时间。
混凝土浇筑过程中,如果中间间歇时间超过了混凝土的( )时间,在这种情况下应留置施工缝。
现代营销学的整体产品所包含的层次中,满足顾客真正购买动机的是()。
如果一个数学测验试题的文字难度太大,超过学生自身的水平,那么这个测验就是()
结合材料回答问题:材料1有个人不小心打碎一个花瓶,但他没有陷入沮丧,而是细心地收集起满地的碎片。他把这些碎片按大小分类称出重量,结果发现:10~100克的最少,1~10克的稍多,0.1~1克和0.1克以下的最多;同时他还发现这些碎片的重量之间存在
MissWanghasmetProfessorKennedybefore.
Whatdidthemanwant?
•Readthearticleaboutthefutureoftheairlineindustry.•Choosethebestwordtofillineachgap,fromA,BorC.•Foreach
最新回复
(
0
)