首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
财务会计
It’s one of our common beliefs that mice
It’s one of our common beliefs that mice
免费考试题库
2019-12-17
28
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 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 (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."Which of the following statements is true according to the passage 查看材料
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
寄生虫会对未出生的小孩造成致命性的伤害,故A排除;文章只表明这种感染对老鼠的大脑有永久性的改变,并没有提及人类,故C排除;寄生虫对人类有危害,但是并不能说明对老鼠没有危害,故D排除。文章最后一段指出,人们一旦受到细菌感染就希望吃抗生素来清除所有的感染,并希望所有的症状都能消失,但是这种想法是错误的,由此推断出B是正确的。
转载请注明原文地址:https://ti.zuoweng.com/ti/pYzlKKKQ
相关试题推荐
It’soneofourcommonbeliefsthatmice
It’soneofourcommonbeliefsthatmice
It’soneofourcommonbeliefsthatmice
It’soneofourcommonbeliefsthatmice
It’soneofourcommonbeliefsthatmice
随机试题
下列属于主动监测的是 A.法定传染病报告系统 B.卫生防疫部门开展的传染病漏
对合同对方索赔报告的反击和反驳,一般可以从()几个方面进行。
属于“质反应”的指标有
关于闭经的诊断,下列哪项是错误的
[单选题]幼儿期儿童的主导活动是( ):
往心阳虚衰,突然出现冷汗淋漓,四肢厥冷,面色苍白,呼吸微弱,心胸剧痛,神志模糊,
个人非法吸收或者变相吸收公众存次数额在____以上的,到达非法集资标准。A、20万元B、15万元C、10万元D、5万元
公司制创投企业的必备投资者,对创投企业的认缴出资及实际出资分别不低于投资者认缴出资总额及实际出资总额的()。A、30%B、25%C、20%D、15%
小学低年级儿童常常认为听父母或大人的话就是好孩子。根据皮亚杰的道德发展阶段理论,这是因为他们的道德发展处于( )。A.自我中心阶段B.权威阶段C.可逆性阶
白化症的病因是由于先天性缺乏( )A.酪氨酸酶B.酪氨酸转化酶C.尿黑酸氧化酶D.苯丙氨酸羟化酶E.对羟苯丙氨酸氧化酶