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
职业资格
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 ca
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 ca
admin
2022-01-25
23
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 the cat and run away in fear. This has always been thought to be something that is
hard-wired
into a mouse’s brain.
But now Wendy 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 mice reacted to a cat’s urine 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 fearlessly
C、became more sensitive to cat’s smell
D、were more afraid of cats
答案
B
解析
细节题。根据第四段中的“。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。故本题选B。
转载请注明原文地址:https://kaotiyun.com/show/qd3v777K
本试题收录于:
英语学科知识与教学能力题库教师资格分类
0
英语学科知识与教学能力
教师资格
相关试题推荐
教学案例:(师)上课前一分钟,先请一学生在讲台上玩电子游戏(大屏幕展示给全班学生看),游戏结束时上课铃声已约过一分钟。(师)不顾上课铃声,再请一学生上讲台继续玩,两分钟后游戏结束。(连续问全班学生)继续玩好吗?整个上午就玩下去好吗?如果不够刺激,玩输
设计任务:请阅读下面学生信息和语言素材,设计一节课的教学方案。教案没有固定格式,但须包含下列要点:teachingobjectivesteachingcontentskeyanddifficultpoints
IfateachergivescommandsinEnglishandasksstudentstoshowunderstandingbyactionorgestures,he/sheismostprobably
Inteachingpronunciation,theteachershouldtellthestudentsthat______canbeusedtoconveymoreimportantmessages.
Exceptionalchildrenaredifferentinsomesignificantwaysfromothersofthesameage,forthesameage,forthesechildrento
Backintheolddays,whenIwasachild,wesataroundthefamilyroundtableatdinnertimeandexchangedourdailyexperience
______maybedefinedasanykindofengagingwiththelanguageonthepartofthelearners,usuallyundertheteacher’ssupervi
Backintheolddays,whenIwasachild,wesataroundthefamilyroundtableatdinnertimeandexchangedourdailyexperiences
Drunkendriving,sometimescalledAmerica’ssociallyacceptedformofmurder,hasbecomeanationalepidemic.Everyhourofever
Whenateacherteachesthewords"bus"and"car",hethoughtthatsomestudentswouldaskhowtospeak"中巴"inEnglish,sohen
随机试题
求。
8岁患儿,胸骨左缘第3及4肋间听到响亮而粗糙的收缩期杂音,应考虑为
鞣制的性质是()
关于多发外伤患者的急救和转运,下列错误的是
丹毒的致病菌为
创伤感染后的营养代谢变化,下列描述哪项是错误的
依次填入下列各句横线处的词语,最恰当的一组是()①这价钱哪儿贵呀?这可是_________的黄金。②看着乡亲们干劲_________地重建家园,县长悬着的心终于放下了。③你放心,本店的商品,分量_________,童叟无欺。
伦理学家:在通常情况下,不经患者同意就采取某种试验性的医疗措施是错误的,因为患者有权根据所有可供选择的详细医疗方案,接受或者拒绝某种治疗。但在紧急救治的情况下,有时候只有越过患者对试验性治疗的同意权,才能知道如何对紧急病人进行最好的医疗处置。因此,应当允许
直线L1:与直线L2:的距离为().
Pentiure微处理器在保护模式下使用段选择描述符,从而可以获得被访问存储空间的段基础、段限界以及段的状态和控制信息,段选择子中包含有下列哪些信息?______。Ⅰ.请求的特权等级(RPL)Ⅱ.描述附表的类型(全局描述符表或局部描述符表)
最新回复
(
0
)