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
Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters,【72】. One micron is a thousa
Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters,【72】. One micron is a thousa
admin
2011-01-05
73
问题
Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters,【72】. One micron is a thousandth of a millimeter; a pinhead is about a millimeter across. Red-shaped bacteria are usually from two to four microns long, while rounded ones are generally one microns in diameter. Thus, if you enlarged a rounded bacterium a thousand times,【73】. An adult human magnified by the same amount would be over a mile (1.6 kilometers) tall.
Even with an ordinary microscope, you must look closely to see bacteria.【74】, one finds that bacteria are barely visible as tiny rods or dots. One cannot make out any things of their structure. Using special strains,【75】. Others have only one flagellum. The flagella (游丝) rotate, pushing the bacteria through the water. Many bacteria lock flagella and cannot move about by their own power,【76】.
From the bacterial point of view, the world is a very different place from what it is to humans. To a bacterium,【77】. Bacteria are so small that they are influenced by the movements of the chemical molecules around them. Bacteria under the microscope, even those with no flagella, often bounce about in the water. This is because【78】. Molecules move so rapidly that within a tenth of a second the molecules around a bacterium have all been replaced by new ones; even bacteria without flagella are thus constantly exposed to a changing environment.
Sentence:
A. Using a magnification of 100 times.
B. It would be just about the size of a pinhead.
C. Water is as thick as molasses is to us.
D. The bacteria content different liquids.
E. Bacterial size is measured in microns.
F. While other can glide along over surfaces.
G. They collide with the water molecules and are pushed this way and that.
H. One can see that some bacteria have attached to the wavy-looking "hairs" called flagella.
选项
答案
H
解析
转载请注明原文地址:https://kaotiyun.com/show/X2VK777K
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
(1)IfyouwanttoknowhowIspendmymoney,gotoBlippy.com.EachtimeImakeapurchaseonmycreditcard,theamountI’vesp
Thevenerable20-volumeOxfordEnglishDictionarycontainsabout700,000words,buttheeditorsrecentlyrealizedtheyweremiss
Ordinarilywepaylittleattentiontothewordswespeak.Weconcentrateinsteadonthemeaningweintendtoexpressandaresel
PassageTwoWhat’smaleinterviewers’impressiononlessfemininewomeninterviewees?
(1)Menandwomenapproachproblemswithsimilargoalsbutwithdifferentconsiderations.Whilemenandwomencansolveproblems
WhenJulesVernewroteJourneytotheCenteroftheEarthin1864,thereweremany【C1】________theoriesaboutthenatureofthe
The"standardofliving"ofanycountrymeanstheaverageperson’s【C1】________ofthegoodsandservicesthecountryproduces.
Weighingtoomuchcandamageone’shealth,andobesityisagrowingproblemforbothkidsandadultsaroundtheworld.【T1】______
Ballroomdancingusedtobeseenassomethingrather【T1】________thatoldpeoplemightdo.Forthepastfiveyearsthough,the【T2
A、Drawattentiontoherself.B、Followwhatotherpeopledo.C、Beagoodlistener.D、Drinkalittleandtalkinalowvoice.A由原文
随机试题
全草类药材的入药部位是()。
在研磨中起调和磨料、冷却和润滑作用的是研磨剂。()
标志着企业战略管理的研究进入能力研究新阶段的著作是()
凡士林灭菌方法,应采用
有经济全球化的大背景下,世界产业发展的主要趋势为()。
关于上市公司不得公开发行证券,下列说法错误的是()
某洗衣公司是一家私人公司,该公司既无正式的工资结构体系,也没有制定工资率或使用薪酬因素,工资水平同周围社会的平均水平持平。公司老板在制定工资制度时,并未进行正式的薪水调查。他几乎每天都在阅读求职广告,并通过他在当地洗衣工和清洁协会的朋友进行非正式的薪水调查
被告人除自己行使辩护权以外,还可以委托1~2人作为辩护人。下列不能被委托为辩护人的是()。
有以下程序#includeintfun(intn){inta;if(n==1)return1;a=n+fun(n-1);return(a);}main(){printf("%d\n",fun(5));}程序的输出结果是
First,PeterandCrystalmusthavea/an______
最新回复
(
0
)