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
2018-08-10
42
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/Gcrd777K
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
Myfatherbelievedthatthereweremysteriousforces(神秘的力量)atworkintheworld.Oneday,hewaslecturingmeonthosemysteri
JonathanRiverslivedaloneinaneathouseinComptonStreetandworkedinLondon.Likemanyothersinglemenintheirmiddlea
LatelyIhavebeennoticingthegreatnumberofelectricalappliances(电器)onthemarket.Itseemstomethatthereare(36)
MostfamiliesinChinahopedtheirsinglechildrenwill1.______haveahappyfuture,sotheyareverystrict
Hisexperiencesuggeststhathecan______thecomputerwithoutmuchdifficulty.
Amandaiscarefulaboutanythingthattouchesherlips.She【C1】______instructionsoneveryfoodpackanddoesallshecanto【C
Abusinessmanowedalotofmoneytoothersandcouldseenowayout.Hesatontheparkbench,【C1】_______ifanythingcouldsave
Jimwasbornafterhiselderbrotherandsister.Hecouldlearnmanythingsfromthem.Soon,hedevelopedhisownwayofdoingt
Peoplebuyittogetonatrainorintoapark.Itcarriespeoplealongtheroadtoanotherplace.
随机试题
慢性肾功能不全时,代谢性酸中毒的原因包括
下列哪项不属于药材的净度标准
新建一宗教建筑(二、三层)位于原有寺院内与原单层的大殿西侧相距4.50m,需采取哪种措施,才能满足防火规范要求?(注:原有大殿耐火等级三级;新建建筑二级)[2005年第42题]
明挖法施工地铁区间隧道结构一般为整体浇筑或装配式矩形结构,其优点是()。
下列属于按照税收的计税标准不同进行分类的是()。
甲企业2012年为开发新技术发生研发支出共计800万元,其中研究阶段支出200万元,开发阶段不符合资本化条件的支出60万元,其余的均符合资本化条件。2012年末该无形资产达到预定可使用状态并确认为无形资产。根据税法规定,企业为开发新技术、新产品、新工艺发生
ABC会计师事务所的A注册会计师负责审计甲集团公司2017年度财务报表,与集团审计相关的部分事项如下:(1)A注册会计师在了解集团及其环境、集团组成部分及其环境的基础上,制定集团总体审计策略,包括确定财务报表整体的重要性和适用于特定类别交易、账户余额或披
UNESCO
carbonsink
Wedon’thavebedsinthespacecraft,butwedohavesleepingbags.Duringtheday,whenweareworking,weleavethebagstied
最新回复
(
0
)