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
2022-12-26
55
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 and 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 author’s attitude towards the experiment is________.
选项
A、positive
B、subjective
C、negative
D、objective
答案
D
解析
态度题。在整篇文章中,作者都是在客观地叙述Wendy Ingram的新发现。故本题选D。
转载请注明原文地址:https://kaotiyun.com/show/DsVD777K
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
()要求导游员在讲解过程中,条理要清,层次要分明,前后呼应,合乎逻辑。
“迎客松的主干高大挺直,修长的翠枝向一侧倾斜,如同一位面带微笑的美丽少女向上山的游客热情招手。”这种修辞手法是()。
导游语言包括()。
下面属于徐弘祖《黄果树瀑布记》中描写瀑布的句子是()。
根据《中华人民共和国国家通用语言文字法》,汉语文出版物中需要使用外国语言文字的,应当用()作必要的注释。
某大学生张晓发表的一篇原创文章被杂志社收编,该文章的著作权归()所有。
Whatroledoeshe/sheplaywhenateacherexplainsthepurposeofatask,thestepstodoitanditstimelimit?
Whichofthefollowingactivitieshasafocusongramma
Sallywasabitshy,butherteacherfoundherquite_________discussingarecentfilmwithothers.
Themorpheme"-s"intheword"birds"isa(n)
随机试题
(2013年7月第28题)等级量表
12岁男孩,患右侧腹股沟斜疝3年。最恰当的手术方式为
关于调制解调器(Modom),下列叙述中正确的是()。
某企业决定在农村设厂,则该企业可以享受的税收优惠不包括哪一项()。
党的干部路线的集中体现和核心内容是()。
水泥的原料是很便宜的,像石灰石和随处可见的泥土都可以用作水泥的原料。但水泥的价格会受石油价格的影响,因为在高温炉窑中把原料变为水泥要耗费大量的能源。基于上述断定最可能得出以下哪项结论?
设AX=A+2X,其中求X.
以下程序给指针p分配三个double型动态内存单元,请填空。#include<stdio.h>#include<stdlib.h>main(){double*p;p=(double*)mallo
A.bykeepingitsoriginalshapeandcolorB.inthelifeofcutflowersC.toproducecarbondioxideD.foraslongaspossibleE.b
RupertBrookeRupertBrooke,oneoftheleadingpoetsofhisgeneration,wasrenownedasaromantic,unlikemanyofhiscont
最新回复
(
0
)