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

admin2022-12-26 36

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."
Which of the following statements is true according to the passage?

选项 A、Toxoplasma gondii causes people strange and deadly diseases.
B、With certain infection the infectious disease cannot be cured completely.
C、Human beings infected by Toxoplasma gondii will have permanent brain damage.
D、Toxoplasma gondii is harmful to human beings, but it does no harm to mice.

答案B

解析细节题。弓形虫会对胎儿造成失明或致命的伤害，A项说法与原文不符，故排除A；文章只表明这种感染对老鼠的大脑有永久性的改变，并没有提及其对人类大脑造成的影响，故排除C；弓形虫对人类有危害，但是并不能说明对老鼠没有危害，故排除D。最后一段指出，人们一旦受到细菌感染就希望服用抗生素来消除这种感染并希望所有的症状都能消失，但是这种想法是错误的，由此可以推断出B项是正确的。

转载请注明原文地址:https://jikaoti.com/ti/aZLiFFFM

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

英语学科知识与教学能力

教师资格

相关试题推荐

随机试题

最新回复(0)

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

英语学科知识与教学能力

教师资格

来自上层社会的游客大多严谨持重，期待听到()的导游讲解。

在中国L字签证是发给()的人员。

导游人员要想在游客心目中树立良好的导游形象，必须做到()。

旅游活动中出现事故，导游服务集体各成员应从大局出发，同心协力处理好事故，然后分析原因，分清责任。()

下列各组短语中，数字用法全部正确的是()。

OfallthechangesthathavetakenplaceinEnglish-languagenewspapersduringthepastquarter-century,perhapsthemostfar-re

以下关于我国出版物发行业改革开放时期的说法，正确的是()。

成本核算业务与其他会计业务比较，其特点有()

根据《中华人民共和国药品管理法实施条例》，应当定期发布质量公告的是

2004年实行的《商业银行资本充足管理办法》规定，计入附属资本的长期次级债务不超过核心资本的()。

在运用审计抽样实施控制测试时，下列各项中，与样本规模同向变动的是()。

为共同营造文明和谐的网络环境，你单位在辖区内组织一个网上征文和知识竞赛活动，领导让你以“文明上网。共建和谐”为主题做一个该活动启动仪式上的讲话。

请从四个选项中，诜柽最合适的一个填入问号处，使之呈现一定规律性：

甲酒后到一洗浴中心进行足浴，发现为其洗脚的女服务员乙很漂亮，于是提出要与乙发生性行为，遭乙拒绝。甲便采取暴力欲强奸乙。乙在反抗中用修脚刀刺死了甲。乙的行为属于()。(2011年单选5)

软件测试是为了发现错误而执行程序的过程。检验软件是否满足用户需求的测试称为(114)。(115)是维护中常用的方法，其目的是检验修改所引起的副作用。黑盒测试法主要根据(116)来设计测试用例。