首页
登录
职称英语
[originaltext] This room is devoted to electric fish. The eel in the tank be
[originaltext] This room is devoted to electric fish. The eel in the tank be
游客
2023-08-21
28
管理
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://tihaiku.com/zcyy/2944518.html
相关试题推荐
[originaltext]AmericanvisitorstoEasternAsiaareoftensurprisedandpuz
[originaltext]Thefamilyischanging.Inthepast,grandparents,parents,a
[originaltext]Thefamilyischanging.Inthepast,grandparents,parents,a
[originaltext]M:I’msotired,Ican’tseestraight.W:You’vebeentiredalot
[originaltext]M:I’msotired,Ican’tseestraight.W:You’vebeentiredalot
[originaltext]W:Haveyouevervisitedaredwoodforest?Irecentlyhadachanc
[originaltext]W:Haveyouevervisitedaredwoodforest?Irecentlyhadachanc
[originaltext]W:Haveyouevervisitedaredwoodforest?Irecentlyhadachanc
[originaltext]M:I’mlookingforanunfurnishedtwo-bedroomapartment,butall
[originaltext]M:I’mlookingforanunfurnishedtwo-bedroomapartment,butall
随机试题
机动车在道路上发生故障,需要停车排除时,驾驶人应该怎么办?()A.将车停在道路
配置POP3服务器时,邮件服务器中默认开放TCP的( )端口。A.21 B.
A.香砂平胃散加减 B.大承气汤加减 C.养脏散加减 D.少腹逐瘀汤加减
发生下列( )事项时,发承包双方应当按照合同约定调整合同价款。A、工程变更
治疗失眠,健忘,心悸,自汗出,应选用的药物是A.朱砂 B.酸枣仁 C.合欢皮
采用支出法核算国民收入,核算国内生产总值的项目有:A.消费B.投资C.净出口D
下列关于历史文化名城保护规划的表述,不正确的是()。(2008年真题)A.
简述智力激励法。
避税型证券组合通常投资于(),这种债券免缴联邦税,也常常免缴州税和地方税。
正常人的平均脉搏为72次/分,测定其中100人,平均为78次/分,标准差为5次/
最新回复
(
0
)