首页
登录
职称英语
[originaltext] Our topic today is about fleas that plague all of us who have
[originaltext] Our topic today is about fleas that plague all of us who have
游客
2024-05-08
35
管理
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、They can live in meadows.
B、They can jump high to get food.
C、They can live off many different kinds of hosts.
D、They can survive without eating for many months.
答案
D
解析
According to the passage, in what way are fleas flexible in their diets?
转载请注明原文地址:https://tihaiku.com/zcyy/3588902.html
相关试题推荐
[originaltext]Arecentstudyrevealshighereducationtendstospeedupmen
[originaltext]Arecentstudyrevealshighereducationtendstospeedupmen
[originaltext]Theaveragepersonlearnsmostofthe30,000-40,000wordswho
[originaltext]Theaveragepersonlearnsmostofthe30,000-40,000wordswho
[originaltext]Theaveragepersonlearnsmostofthe30,000-40,000wordswho
[originaltext]W:Goodafternoon,sir.WhatcanIdotohelp?M:Oh,Ihaveate
[originaltext]W:Goodafternoon,sir.WhatcanIdotohelp?M:Oh,Ihaveate
【B1】[br]【B8】[originaltext]Tobesuccessfulinajobinterview,youshould
【B1】[br]【B6】[originaltext]Tobesuccessfulinajobinterview,youshould
【B1】[br]【B4】[originaltext]Tobesuccessfulinajobinterview,youshould
随机试题
【B1】[br]【B8】[originaltext]Art,saidPicasso,isaliethatmakesusreali
Theappealofadvertisingtobuyingmotivescanhaveboth【B1】______andposi
[audioFiles]audio_eusm_0109(20106)[/audioFiles]A、Fireprevent.B、Pestcontrol.
将“具有中国特色国际领先的能源互联网企业”确立为国家电网有限公司的战略目标,(
目前,建筑业劳务作业分包企业的资质划分为()类。A.12 B.13 C.1
第三版巴塞尔资本协议进一步提高了监管资本的最低要求,一级资本充足率提高至()。
根据我国《宪法》的规定,下列关于公民基本权利的宪法保护的表述,哪些是错误的?A.
哪些不属于影响药物分布的因素A.药物与组织的亲和力 B.血液循环系统 C.药
某实施监理的工程,招标文件中工程量清单标明的混凝土工程量为2400m3。投标文件
老年人口增加可使A.死亡率增加 B.婴儿死亡率下降 C.生育率下降 D.出
最新回复
(
0
)