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 c
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 c
admin
2015-06-09
39
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 recently Wendy Ingrain, 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 un-born babies.
However, the parasite’s effects on mice are unique. Ingrain and her team measured how mice reacted 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 a-round 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. Toxoplasma gondii can only reproduce inside a cat. So the parasite had to develop a way of tricking the mice into getting eaten more easily——thus helping itself go inside a cat--by taking away mice’s sense of alarm.
The author’s attitude towards the experiment is______________.
选项
A、positive
B、subjective
C、negative
D、objective
答案
A
解析
观点态度题。A项意为“积极的”;B项意为“主观的”;C项意为“消极的”;D项意为“客观的”。根据文章第四段中的“The parasite was found to be more powerful than originally thought”可知,作者对此实验的态度是积极的。所以A项正确。
转载请注明原文地址:https://kaotiyun.com/show/Msdq777K
本试题收录于:
中学英语题库特岗教师招聘分类
0
中学英语
特岗教师招聘
相关试题推荐
It’soneofourcommonbeliefsthatmiceareafraidofcats.Scientistshavelongknownthatevenifamousehasneverseenac
It’soneofourcommonbeliefsthatmiceareafraidofcats.Scientistshavelongknownthatevenifamousehasneverseenac
Hairlosscanbedestructiveforthemillionsofmenandwomenwhoexperienceit.Nowscientistsarereportingthatasubstance
Hairlosscanbedestructiveforthemillionsofmenandwomenwhoexperienceit.Nowscientistsarereportingthatasubstance
Oneof__________mostcommonillnessesinoursocietyis"timesickness",__________senseoftimepressureandhurrythatcauses
Scienceisbaseduponobservation.However,observation【C1】_________isnotscience.Scientistsgenerallystateaproblem.Then【C
Scienceisbaseduponobservation.However,observation【C1】_________isnotscience.Scientistsgenerallystateaproblem.Then【C
Scienceisbaseduponobservation.However,observation【C1】_________isnotscience.Scientistsgenerallystateaproblem.Then【C
Scienceisbaseduponobservation.However,observation【C1】_________isnotscience.Scientistsgenerallystateaproblem.Then【C
随机试题
社长、主编和副主编三人轮流主持每周一的编辑部发稿会。某年(非闰年)1月6日的发稿会由社长主持,问:当年副主编第12次主持发稿会是在哪一天?()
某县公安局依《治安管理处罚法》对本局工作人员李某的赌博行为予以处罚而形成的相互关系是()。
以下属于程序化决策方法的是()
一般情况下,机械修配厂的火灾危险性按()确定。
综合性学习是当代教育发展的一个新特点,美术课程特别设置了()这一新的学习领域,旨在发展学生的综合实践能力和探究发现能力。
一次测验后,教师发现一年级学生在加减法运算中常有进位数加错、看错数字等现象,教师根据学生的错误进行补救与指导,这种测验属于()。
甲在化肥中掺入泥土,销售金额达20万元,但并未对相关农业生产造成影响。对甲的行为()
以下不是Access预定义报表格式的是______。
PASSAGEFOURWhat’sthepurposeofthispassage?
UsingtheMindAgainstDiseaseUsingthemindtofightdiseasesPsychologyhasanewapplicationinthefieldofmedicine.M
最新回复
(
0
)