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、To destroy tree roots. B、To digest its food. C、To protect its territory. D、To find its way. D“navigate”是“导航”的意思。与其意思相同的只有选项D里面
A、To destroy tree roots. B、To digest its food. C、To protect its territory. D、To find its way. D“navigate”是“导航”的意思。与其意思相同的只有选项D里面
admin
2015-07-16
106
问题
This room is devoted to electric fish. The eel in the tank behind me can produce a strong jolt of electricity to stun its prey, but most of the fish in here produce only weak electrical impulses that are useful for navigating. Locating food, and even for communicating.
The knife fish is good example. This fish navigates using tiny receptors in the skin that are sensitive to electrical impulses. The knife fish produces an electrical signal, and the receptors in its skin let it know when the signal it distorted by a tree root, or some other obstacle, so it can go around it.
Fish also use the ability to produce and detect electrical impulses to communicate. They can tell each other what species they belong to, how big they are, and whether they’re male or female. We have a tank here that’s specially equipped to convert the inaudible signals the ish produce into sounds you can hear when you put on these headphones. I urge you all to listen in when I’m done speaking.
Now have a look at the electric rays. Rays are especially interesting to medical researchers because of the organs they use to produce electricity. These organs contain a chemical that carries signals from one nerve ending to the next, not only in rays, but also in people. By studying these organs, scientists hope to learn more about diseases that interrupt the transmission of impulses from one nerve to another.
5. What is the talk mainly about?
6. What does the knife fish use electricity for?
7. Why does the speaker suggest putting on headphones?
8. According to the speaker, what medical benefits might from studying electric rays?
选项
A、To destroy tree roots.
B、To digest its food.
C、To protect its territory.
D、To find its way.
答案
D
解析
“navigate”是“导航”的意思。与其意思相同的只有选项D里面的“find itsway”
转载请注明原文地址:https://kaotiyun.com/show/HfQ7777K
0
大学英语六级
相关试题推荐
A、Eachflockofbutterflieslayseggsinthesamestates.B、Theystarttolayeggswhentheyareninemonthsold.C、Eachgenerat
A、Theyhavebrightcolorsandintricatepatterns.B、TheycanonlysurviveinpartsoftheAmericas.C、Theyaretheonlyinsectt
A、Theyhavelittletimelefttorenewcontactwiththeirbrothersandsisters.B、Theytendtoforgetpastunhappymemoriesandf
Forinvestorswhodesirelowriskandguaranteedincome,U.S.governmentbondsareasecureinvestmentbecausethesebondshave
Testsmaybethemostunpopularpartofacademiclife.Studentshatethembecausetheyproducefearand【B1】______aboutbeingeva
Forthispart,youareallowed30minutestowriteanessayentitledOntheImportanceofRobotstotheDevelopmentofSociety.
A、Atthepostoffice.B、Attheshop.C、Attherestaurant.D、Atthebank.B
A、Italy.B、France.C、Switzerland.D、Spain.B细节题。由Franceiswherewehavethemajorityofsites可知,PSCamping公司在法国拥有最多的露营地,所以选B。
Allourdreamshavesomethingtodowithourfeelings,fears,longings,wishes,needsandmemories.Ifapersonishungry,orti
A、Hewastoldtoboardthewrongplane.B、Hewasnotallowedtoboardtheplane.C、Hearrivedattheairportonlytofindhisti
随机试题
下列哪些可见于肺炎链球菌肺炎患者
男性40岁,1周前干咳左胸痛,近2日来,畏寒发热38.8℃,气急乏力。体检:心率94次/分,律齐,左胸廓饱满,呼吸运动减弱,左下叩之浊音至实音,语颤减低,呼吸音明显减低。经检查诊断明确后,所给予的下列治疗中哪一项是错误的
患者,女,26岁。产后18小时,突然发生阴道大量出血,色鲜红,头晕目花,心悸怔忡,肢冷汗出,面色苍白;舌淡,脉虚数。下列有关该病的西医治法,说法错误的是
丁公司欠甲公司100万元。2005年10月,甲公司与丙公司签订协议,约定甲公司对丁公司的100万元债权由丙公司享有,但未通知丁公司。同年12月,丙公司向法院起诉丁公司要求归还欠款,有关该案的表达正确的是:()
项目风险的分解途径不包括()。
民用住宅楼梯的坡度范围,宜在()之间。
在临时用地指标中,要求平面布置合理、紧凑,在满足环境、职业健康与安全及文明施工要求的前提下尽可能减少废弃地和死角,临时设施占地面积有效利用率大于()。
简述蒙古统一与元朝建立的经过。
(),对公安工作和队伍建设提出了新的挑战,公安工作和公安队伍建设存在的突出问题迫切需要抓紧解决,这是当前加强正规化建设、明确现阶段新的管理标准的出发点和立足点。
Standingupstraightandkeepingyourbodycenteredmayseemlikesecondnaturetomostofus.Butforpeoplewithbalancedisor
最新回复
(
0
)