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
外语
A、Rat flea. B、Cat flea. C、Dog flea. D、Rabbit flea. A细节题。fatal意为“致命的”,文中提到的It is the rat flea that is responsible for carrying so
A、Rat flea. B、Cat flea. C、Dog flea. D、Rabbit flea. A细节题。fatal意为“致命的”,文中提到的It is the rat flea that is responsible for carrying so
admin
2010-11-02
34
问题
Our topic today is about fleas that plague all of us who have cats and dogs in our homes. You may be surprised to find out that there are about 1,500 species of fleas, and that each species has its own preferred host. Fleas are, in fact, quite adept at finding their hosts. In an experiment, 270 fleas from rabbits were marked and then let loose in a large meadow. After a few days, a full half of the fleas had found rabbits to live on. Fleas also have a very interesting flexible diet. They can go for many months without eating if they have to, and they will change hosts in order to get more food, even if they don’t like the taste of their new host as much as the old! Their jumping ability is incredible, too. You may know this from your own experience. Some fleas can jump as high as 13 inches, which is quite a lot for such a small creature. This jumping ability comes from their relatively large muscular legs that are equipped with resilin, a kind of natural rubber. The elastic properties of this resilin have not yet been equaled in any artificial substance. Though the fleas on your cat or dog are not dangerous to you, some fleas carry diseases. It is the rat flea that is responsible for carrying some fatal plagues. These fleas have been in part responsible for the Great Plague of Europe in 500 A.D. that spread from Ethiopia to Byzantium to Europe. They are also part of the cause of Black Death in China and Europe.
选项
A、Rat flea.
B、Cat flea.
C、Dog flea.
D、Rabbit flea.
答案
A
解析
细节题。fatal意为“致命的”,文中提到的It is the rat flea that is responsible for carrying some fatal plagues.(是老鼠身上的跳蚤带来了黑死病。)表明rat flea可以导致死亡,选项A正确。
转载请注明原文地址:https://kaotiyun.com/show/SQs7777K
0
大学英语六级
相关试题推荐
Bullying(欺凌弱小者)atSchool:TacklingtheProblemA.Abroaddefinitionofbullyingiswhenastudentisrepeatedlyexposedto
TheLawofSupplyandDemandIftradeistotakeplace,atleasttwoeconomicunitsmustbeinvolved(business,households,
GMOrganismsByfarthemostcommongeneticallymodified(GM)organismsarecropplants.Butthetechnologyhasnowbeenapp
OnemajordecisionwhichfacestheAmericanstudentreadytobeginhighereducationisthechoiceofattendingalargeuniversit
A、Energyconservation.B、Anewkindoftransportation.C、Stripcities.D、Advantageso{airtransportationoverrailroads.B
A、Mikedoesn’talwayslisten.B、Mike’snevermissedameeting.C、Mikehadtoattendanothermeeting.D、Mikehasanearinfection
WhydoestileFoundationconcentrateitssupportonbasicratherthanappliedresearch?Basicresearchistheveryheartofscie
WhenauthenticfiguresontheChineseandworldoilmarketsin2005finallybecameavailable,thetruthabouttheso-called"Chi
A、Heshouldn’thaveapologized.B、Hewillfindabetterwayofapologizing.C、Hecouldn’tfindarightwordtomakeanapology.
随机试题
芯头的作用不包括()。
求微分方程xy’=ylny的通解.
能使蛋白质沉淀(不发生变性)的试剂为
(2002年第90题)下列哪项检查用于周围神经损伤的诊断
影响基础体温的激素为:
房屋的商品租金又称全价租金,是指以物业价值为基础确定的租金,由()因素构成。
自铁路运输企业发出领取通知之日起满90日仍无人领取的包裹,铁路运输企业可以变卖。()
当前完善社会主义市场经济体制的主要任务是()。
WheneverIhaveanappointment,Iliketoarrive______.
自从1978年市场化改革(marketreforms)以来,中国经济已经逐渐从集中的计划经济向市场经济转变,中国经济和社会发展迅速。
最新回复
(
0
)