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
There axe cockroaches(蟑螂)everywhere on Earth except the places that axe covered with ice. Scientists have discovered about 3,500
There axe cockroaches(蟑螂)everywhere on Earth except the places that axe covered with ice. Scientists have discovered about 3,500
admin
2010-02-20
89
问题
There axe cockroaches(蟑螂)everywhere on Earth except the places that axe covered with ice. Scientists have discovered about 3,500 different species of cockroach. There is just one human species! Cockroaches can be anything in size from about five mm to nine cm. Although five mm is very small, nine cm is as long as a large rat.
It is very difficult to catch most cockroaches. They "see" with the hairs on their bodies. These hairs can feel the smallest movement in the air, so the cockroaches know immediately something moves, and run to safety.
Of all the species of cockroach, fortunately only three live among humans and axe a serious problem. They are the German, the Oriental, and the American. One egg case of the German cockroach can produce as many as seven million cockroaches in 12 months!
Our main problem with cockroaches is that not only do they look ugly to us, but they also carry diseases. They axe particularly dangerous in hospitals as they eat all kinds of hospital waste or get it on their bodies. They can then carry this waste, which may contain dangerous bacteria, on to food which is then eaten by people in the hospital.
Most of the bacteria that cause food poisoning have been found in the stomachs of cockroaches, so it is important that cockroaches should be kept out of restaurants and other places where food is pre pared.
Many people work and try to destroy cockroaches, but as soon as they find one way of doing it, the cockroaches "learn" how to deal with it. Electricity does not always kill them and they can avoid most poisons or "learn" how to deal with others. At one time, scientists thought that radiation would kill them, but they have been on Earth for about 300 million years, and it does not harm them as much as it does us.
It seems probable that when there are no longer human beings living on the Earth, cockroaches will still be here.
选项
答案
how and where cockroaches live, and difficulty of controlling them
解析
主旨题。本文主要介绍了地球上蟑螂的数目及其生活习性。科学家们进行了很多研究试图消灭蟑螂,但收效甚微,没有什么好办法消灭蟑螂。
转载请注明原文地址:https://kaotiyun.com/show/3vt7777K
0
大学英语四级
相关试题推荐
A、Goldwasdiscovered.B、TheTranscontinentalRailroadwascompleted.C、TheGoldenGateBridgewasconstructed.D、Telegraphcomm
AfterWorldWarIImostAustralianswerecautiousaboutprospectsforthefuture.Gamblingwasvirtuallyprohibitedexceptont
A、400.B、4,000.C、14,000.D、40,000.CHowmanypeopleinBeijingsucceededinleavingtheirworkplaceslastyear?
Accordingtothefirstparagraph,noiseis______.Noisecontroldemandsthefollowingfactorsexcept______.
A、Thewomanisfeelingmuchworsethanshedidbefore.B、Thewomanfeelsnothingatall,exceptforaheadache.C、Thewomanfelt
Scientiststhinkthemoralists’warningis______.Whatthegovernmentcandoistosetregulationsto______.
A、Shehasbeentoallthecountriesintheworld.B、Hewantshertorecommendsomeplacesshehasbeento.C、Sheisreallylucky
随机试题
将十六进制数3F转换成等值的十进制的数。
A.肉毒梭菌B.产气荚膜杆菌C.志贺菌D.四季豆E.蚕豆食源性疾病中威胁生命致害因子有
关于胸膜腔闭式引流术的护理,错误的是
“会计人员应当遵守职业道德的行为,提高业务素质”这是我国首次在《会计法》中以国家法律形式对会计职业道德所做的具体规定。()
关于团体决策过程中经常使用的德尔菲技术的说法,正确的是()。
常用于心理危机干预的咨询形式是()。
2010年初,我国长三角、珠三角等地区“用工荒”加剧,不少企业拥有生产订单却招不满工人。下列有利于解决“用工荒”问题的措施有()。①维护劳动者的合法权益②政府统筹安排劳动者就业③引导劳动者树立正确的就业观④加强劳
大年初四,某市公安局分局派出所社区民警走进小区。女民警吴鑫身边围绕了不少居民,在社区阿姨等人眼里,她就像他们的女儿一样,为家家户户奔波忙碌。吴鑫开展的下列工作不属于直接服务群众的是()。
传统都有其“原本”,原本是传统的始发言行。传统的始发言行有其特定的原初行动者、受动者和叫作参照系的现实环境。随着时间的推移和历史的进展,原本逐步地被认为是具有权威性的、天经地义的、带有信仰性质的东西而为群体所接受,成为凝聚群体的力量,这样,原本也就逐步地形
设函数f(x)有二阶连续导数,且=-1,则
最新回复
(
0
)