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
公务员
It’s one of our common beliefs that mice are afraid of cats.Scientists have long known that even if a mouse has never seen a cat
It’s one of our common beliefs that mice are afraid of cats.Scientists have long known that even if a mouse has never seen a cat
admin
2017-02-27
78
问题
It’s one of our common beliefs that mice are afraid of cats.Scientists have long known that even if a mouse has never seen a cat before,it is still able to detect chemical signals released from it and run away in fear.This has always been thought to be something that is hard-wired into a mouse’s brain.
But now Wendv Ingram,a graduate student at the University of California,Berkeley,has challenged this common sense.She has found a way to “cure”mice of their inborn fear of cats by infecting them with a parasite,reported the science journal Nature.
The parasite,called Toxoplasma gondii,might sound unfamiliar to you,but the shocking fact is that up to one.third of people around the world are infected by it.This parasite can cause different diseases among humans,especially pregnant women—it is linked to blindness and the death of unborn babies.
However.the parasite’s effects on mice are unique.Ingram and her team measured how minereacted to a cat’s urine(尿)before and after it was infected by the parasite.They noted that normal mice stayed far away from the urine while mice that were infected with the parasite walked freely around the test area.
But that,s not all.The parasite was found to be more powerful than originally thought-even after researchers cured the mice of the infection.They no longer reacted with fear to a cat’s smell,which could indicate that the infection has caused a permanent change in mice’s brains.
Why does a parasite change a mouse’s brain instead of making it sick like it does to humans? The answer lies in evolution.
“It’s exciting scary to know how a parasite can manipulate a mouse’s brain this way,”Ingram said.But she also finds it inspiring.“Typically if you have a bacterial infection,you go to a doctor and take antibiotics and the infection is cleared and you expect all the symptoms to also go away,”she said.but this study has proven that wrong.“This may have huge implications for infectious disease medicine.”
The passage is mainly about______.
选项
A、mice’s inborn terror of cats
B、the evolution of Toxoplasma
C、a new study about the effects of a parasite on mice
D、a harmful parasite called Toxoplasma gondii
答案
C
解析
解析:根据文章第二段“She has found a way to‘cure’mice of their inborn fear of cats by infecting them with a parasite,reported the science journal Nature.”可知,Berkeley发现了一种可通过让老鼠感染寄生虫来改变它们天生害怕猫的方法。文章下面的内容也都是围绕这个新发现来阐述的,故选C。
转载请注明原文地址:https://kaotiyun.com/show/MwHl777K
本试题收录于:
英语题库公安招警分类
0
英语
公安招警
相关试题推荐
“Smartbuilding”isatermthatisverypopularamongopinion-formers,butwhatexactlyisitandhowcarlitbe【C1】______toredu
It’soneofourcommonbeliefsthatmiceareafraidofcats.Scientistshavelongknownthatevenifamousehasneverseenacat
Myhusbandusedtoworkinabankbutduringthecrisishe【C1】______hisjob.Theeconomywasn’tgoodandhehadn’tmany【C2】_____
CostaRicaisfamousforitsnational,parks,buthasonlyrecentlyturnedattentiontosupportingthepeoplewholiveinthem.Joh
Inspiteof“endlesstalkofdifference”,Americansocietyisanamazingmachineforhomogenizingpeople.Thisis“thedemocratizing
Howoftenonehearschildrenwishingtheyweregrown—upsandoldpeoplewishingtheywere46again.Eachagehasitspleasureandi
After20yearsofmarriage,ahusbandmaystillnotunderstandhiswife.Howisitthatsheisneverata46forwords?Howcanshe
After20yearsofmarriage,ahusbandmaystillnotunderstandhiswife.Howisitthatsheisneverata46forwords?Howcanshe
Manystudentsfindtheexperienceofattendinguniversitylecturestobeaconfusingandfrustratingexperience.Thelecturerspe
Manystudentsfindtheexperienceofattendinguniversitylecturestobeaconfusingandfrustratingexperience.Thelecturerspe
随机试题
以测量被调查者的气质、兴趣、态度、价值观等的特点为目的的调查是()
模块的内聚性可以按照内聚程度的高低进行排序,以下排序中属于由低到高的正确顺序的是()
“收到其他与经营活动有关的现金”项目反映企业收到的()
Itseemsthatteenagersarealltakingthesamewayofshowingthattheydisagreewiththeirparents.
因特网的主要特色是()。
关于监理合同的协调管理说法正确的是()。
自动化程度高,不需人工设模的路面铺摊机械是()。
根据下列材料回答下列问题某家公司分别对某市三家酒店的一百名消费者进行问卷调查,下图是对这三家酒店的七类项目的满意度进行评价的结果统计图:消费者对酒店周边交通条件的满意度达到60%以上的酒店有()家。
Researchonembryonicstemcellsiscontroversialbecauseitrequiresthedestructionoflivehumanembryos.Supportersfindit
【B1】【B8】
最新回复
(
0
)