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 pure virus(病毒)could be kept in a bottle, just like hundreds of other chemicals. Yet, when a virus is placed on a living thing,
A pure virus(病毒)could be kept in a bottle, just like hundreds of other chemicals. Yet, when a virus is placed on a living thing,
admin
2016-11-16
77
问题
A pure virus(病毒)could be kept in a bottle, just like hundreds of other chemicals. Yet, when a virus is placed on a living thing, it comes to life. As long as it is on a living material, it grows.
A difficult question still remains—what is a virus? Is it living or chemical? Men of science had always thought life and not-life to be as different as black and white. With the discovery of the virus , they became aware of
a grey area
that was neither black nor white.
Until the 1930’ s, it was accepted that there was also a great difference in size between the largest chemical molecules(分子)and the smallest living things. As new and much finer filters(过滤器)were invented, men were able to measure viruses. The first virus to be measured was found to be about 100 millimicrons(毫微米)across.
The largest known chemical molecule measures only 22 millimicrons. The smallest living thing measures almost seven times that size or 150 millimicrons. When viruses were measured, they were found to range in size from 16 millimicrons to 300 millimicrons. Most were found to be larger than the largest chemical molecules and smaller than the smallest living things.
The answer to the puzzle—what is a virus? —must be that it is both living and not living. In a living cell, it is a live thing. In a bottle, it is nothing more than a chemical. We now realize that the virus is actually a link between life and not-life.
What do the underlined words "a grey area" in paragraph 2 refer to?
选项
A、The discovery of unknown chemicals.
B、Viruses in a state of living and not living.
C、A difficult question unsolved about viruses.
D、The colour of viruses between black and white.
答案
B
解析
推理题。题干意为“第二段中划线词组a grey area指的是什么?”。由文章第二段可知,科学家们总是把有生命和无生命的物体视作是截然相反的两者。随着病毒的发现,他们开始意识到在之前的两者之间还有一个中间的领域,它并不属于任何一方。所以这里的a grey area(灰色领域)指的是病毒处于一种生命体与非生命体的中间地带。故B为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/77ud777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
Isitthewatchyouwant______?
IntheWest,peoplemake______aruletosendChristmaspresenttotheirrelativesandfriends.
Afterthebirthofmysecondchild,Igotajobatarestaurant.Havingworkedwithanexperienced【C1】______forafewdays,Iw
Howmanytimedoyouspendwithyourparents?【M1】______Yourparentsareyourdearerpeopleintheworld
TheInternethasopenedupawholenewon-lineworldforustomeet,chatandgowherewe’veneverbeenbefore.Butjustasinf
6月1日是个星期天,天气晴朗,赵亮和李红一起去参观首都动物园(CapitalZoo),请以赵亮的口气写一篇日记,内容要点如下:1.距离:离家约4公里2.交通工具:坐公共汽车3.时间:9点出发,15分钟后到达4.动物:象、熊
Asaresultofpollution,LakeErie,onthebordersoftheU.S.A.andCanada,nowdoesnothavemanylivingthings.Polluti
Ioftenseelightsinthatemptyhouse.DoyouthinkI______reportittothepolice?
Mr.Duffhadseveralfarmsinthevillage.He36someworkersandmadethemworkmorethantwelvehoursa37Hedidn’tsupplyth
随机试题
一般情况下,一个人对活动的目的、任务的重要意义理解得越清楚、越深刻,对完成任务的愿望越强烈,与完成任务有关的一切事物也就越能引起和保持其()。
简述我国关于涉外合同适用国际惯例的条件。
企业、事业单位应当配备与()相适应的计量检测设施。
下列关于循环周期理论的说法,不正确的是( )。
侯女士是一位单亲妈妈,独自抚养患自闭症的女儿,因女儿患病常被邻居议论。最近侯女士的单位因效益不好而倒闭,母亲又查出患了肺癌,侯女士已对生活绝望,感到孤立无援,向社会工作者小杨求助。小杨了解情况后,决定根据存在主义理论为侯女士提供服务。下列小杨的服务中.符合
把写意花鸟画推向新的发展阶段的是()
下列关于北京市“9064”养老服务新模式的说法,正确的是()。
习近平在纪念邓小平同志诞辰110周年座谈会上的讲话中指出:中国特色社会主义是适合中国国情、符合中国特点、顺应时代发展要求的理论和实践,所以才能取得成功,并将继续取得成功。中华民族创造了具有5000多年悠久历史的辉煌文明,中国人民在中国共产党领导下创造了建
Ifsustainablecompetitiveadvantagedependsonwork-forceskills,Americanfirmshaveaproblem.Humanresourcemanagementisn
A、TheEveningStandard.B、TheTimes.C、TheDailyTelegraph.D、TheMirror.C
最新回复
(
0
)