首页
登录
职称英语
There are cockroaches (蟑螂) everywhere on Earth except the places that are co
There are cockroaches (蟑螂) everywhere on Earth except the places that are co
游客
2023-10-14
11
管理
问题
There are cockroaches (蟑螂) everywhere on Earth except the places that are 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 are 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 are 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 prepared.
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. [br] The passage is mainly about ______.
选项
答案
how and where cockroaches live, and difficulty of controlling them
解析
本文主要谈到蟑螂居住的环境和生存的方式,以及人类对其无法控制的情况,综合全文各段的主题句可以得出本题的答案。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3097059.html
相关试题推荐
TheBritishParliamenthasallpowersexcepttherightto______.A、controltaxat
Allofthefollowingfourexcept______arethemostfamousdramatistsintheRe
Atypisttypes’fourenvelopesandfourletters.Sheplacesthelettersinthee
Atypisttypesfourenvelopesandfourletters.Sheplacesthelettersintheen
Detectivestoriesarepopulareverywhereandsomeoftheworld’sbest-sellin
Detectivestoriesarepopulareverywhereandsomeoftheworld’sbest-sellin
Atypisttypesfourenvelopesandfourletters.Sheplacesthelettersintheen
Americanpresidenthasthefollowingpowerexcept______.A、appointinggovernment
Atypisttypesfourenvelopesandfourletters.Sheplacesthelettersintheen
Atypisttypesfourenvelopesandfourletters.Sheplacesthelettersintheen
随机试题
[originaltext]W:Nowyou’veseenthistableoffiguresaboutthepocketmoneyc
TimeManagementforCollegeStudentsTimeyouspentinh
进行市场调研的目的在于为数字出版产品的生产和营销找到( )。A.用户依据 B
一个完整的保险市场一般是由()构成的。A.保险主体、保险客体和保险价格
周围型肺癌最常见的X线表现是:()A.薄壁空洞 B.肺野周围孤立性圆形
(2017年真题)私募基金监管部的职能有()。 Ⅰ拟定监管私募投资基金
A.表面活性剂的HLB值等于3.5~6 B.表面活性剂的HLB值等于20~25
属于配体门控型离子通道的是A.胰岛素受体 B.N1型乙酰胆碱受体 C.电压依
开放式基金应该收取赎回费。()
某单代号网络计划中,工作M的最早开始时间是第8天,持续时间为5天,该工作有三项紧
最新回复
(
0
)