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
81
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 experiment found that mice infected with toxoplasma gondii_______.
选项
A、stayed far away from cat’s urine
B、moved around the area freely and tearlessly
C、because more sensitive to cat’s smell
D、were more afraid of cats
答案
B
解析
解析:根据文章第四段“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.”可知,受到寄生虫感染的老鼠能够自由随意地在测试区域周围走动,故选B。
转载请注明原文地址:https://kaotiyun.com/show/rwHl777K
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
Myhusbandusedtoworkinabankbutduringthecrisishe【C1】______hisjob.Theeconomywasn’tgoodandhehadn’tmany【C2】_____
Myhusbandusedtoworkinabankbutduringthecrisishe【C1】______hisjob.Theeconomywasn’tgoodandhehadn’tmany【C2】_____
Myhusbandusedtoworkinabankbutduringthecrisishe【C1】______hisjob.Theeconomywasn’tgoodandhehadn’tmany【C2】_____
Thesmartphonebenefitsusalot,butthebadeffect________hasontheyouthcannotbeignored.
“Thekeyto_______themedicalproblemsishealthcarereform,”saidtheminister.
Internationaltradehassocialandculturaldimensions.Whilemuchofthechapterdealswithspecificallyeconomicissues,wemust
Internationaltradehassocialandculturaldimensions.Whilemuchofthechapterdealswithspecificallyeconomicissues,wemust
TheCaliforniaregionboastsawidevarietyofclimatesandgeographicalfeatures,rivalinganyotherareaofcomparabledimensio
Manystudentsfindtheexperienceofattendinguniversitylecturestobeaconfusingandfrustratingexperience.Thelecturerspe
随机试题
华生曾用白兔对一个9个月大的孩子做过一项恐惧形成实验,实验后这个孩子一看见白兔就害怕,后来甚至看见圣诞老人的白胡子也害怕,此现象称为()。
社会主义初级阶段基本路线和基本纲领之间的关系是()。
男,46岁。左颈部淋巴结无痛性肿大1月,间歇发热,最高体温38.5~C。体检:左锁骨上淋巴结肿大,大小约2.0cm×2.5cm×2.5cm。双侧腋窝及腹股沟淋巴结均可触及,约黄豆大小。肝脾B超及胸部cT未发现异常。取淋巴结活组织检查确诊为NHL。此患
下列哪项不是肾病综合征的诊断标准
以下哪一项是执业医师必须具备的完整条件()
下列关于酮体的叙述中,错误的是
属于CM/A非代理型合同结构特征的是()。
卷材防水施工中,厚度小于3mm的高聚物改性沥青防水卷材,严禁采用()施工。
当前“颜值”成为就业的一项硬指标。不少家长在孩子高考后,赠送给孩子的礼物,不再是苹果手机了,而是“微整形大礼包”,希望自己的孩子在大学生活和今后工作中,更加自信、更加成功。南京某医院整形美容中心对接受整形手术者的统计调查表明,对自己的孩子选择做割双眼皮、垫
"MayIspeaktoyourmanagerMr.Williamsatfiveo’clocktonight?""I’msorry.Mr.Williams______toaconferencelongbeforet
最新回复
(
0
)