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
2018-05-03
55
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/1Mrd777K
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
Ifyoucouldgiveanythingintheworldtoyourchild,youmightwanttogivealoveofwords.Youngchildrenwhocanexpressth
Whatarethespeakerstalkingabout?
Ihavealways(36)goingtoschool.Ienjoylearningnewthingsand(37)newpeople.Itrytothinkofmyschoolwork(38
Inthosedaysshewasalwayslostinthought,sothatshehadtobecalledtwoorthreetimes______shecametoherdinner.
Noteveryoneintheworldrequiresthesameamountoflivingspace.Theamountofspaceapersonneedsaroundhimisacultural
Thereisstill______waterinthebottle.
Anaward-winningsubterraneanskyscraperwasrecentlycompletedattheUniversityofMinnesota.DesignedbyDavidBennett,theb
ThePetronasTwinTowersinKualaLumpurinMalaysiawerecompletedin1998.Eachtoweris452metershighandhas88floors.De
A、About3kilometersaway.B、About4kilometersaway.C、About5kilometersaway.A男士要找最近的医院:Excuseme.Isthereahospitalnearh
随机试题
A.24小时之内B.48小时之内C.48小时~2周内D.2~4周内E.4周~6个月内“9.11”事件之后,对于受害者家属,给予个人支持的时间一般为
高频离心铸造机的组成是
热风采暖系统的特征有()。
备案号栏应填()。标记唛码及备注栏应填()。
公开发行公司债券应当符合的条件包括()。Ⅰ.具备健全且运行良好的组织机构Ⅱ.最近三年平均可分配利润足以支付公司债券一年的利息Ⅲ.累计债券余额不超过发行人净资产的50%Ⅳ.国务院规定的其他条件
有效的绩效管理的特征是()。
某资源联合开采企业为增值税一般纳税人,2009年1月生产经营情况如下:(1)专门开采的天然气5千立方米,开采原煤450万吨,采煤过程中生产天然气0.28千立方米:(2)销售开采的原煤200万吨,取得不含税销售额23400万元;(
WhenTonyAbbottbecameAustralia’sprimeministerin2013,almosthisfirstactsweretoabolishthecountry’sClimateCommissi
设x是小于10的非负数。对此陈述,以下正确的VB表达式是
Morethan2,300universitiesinover100countrieshaveintroducedChinesecoursestotheircurricula,andyoungoverseasnation
最新回复
(
0
)