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
42
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 Molecules move so rapidly that within a tenth of a second the molecules around a bacterium have all been replaced by new ones; even bacteria without flagella are thus constantly exposed to a changing environment.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
A
解析
转载请注明原文地址:https://kaotiyun.com/show/W2VK777K
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)Recently,acoupleinNewZealandwereforbiddenfromnamingtheirbabyson4Real.EventhoughNewZealandhasquiteliberal
(1)YellowstoneNationalParkisinthewesternstateofWyoming.Itisoneofthemostunusualplacesintheworld.Extremelyho
The"standardofliving"ofanycountrymeanstheaverageperson’s【C1】________ofthegoodsandservicesthecountryproduces.
Vibrationsinthegroundareapoorlyunderstoodbutprobablywidespreadmeansofcommunicationbetweenanimals.Itseems【C1
ConsideringhowjazzistranscribedinChinese(jueshi),youmaybe【C1】________intoassumingthatitisanaristocraticcultura
Weighingtoomuchcandamageone’shealth,andobesityisagrowingproblemforbothkidsandadultsaroundtheworld.【T1】______
Weighingtoomuchcandamageone’shealth,andobesityisagrowingproblemforbothkidsandadultsaroundtheworld.【T1】______
Hello,everybody.Thankyouverymuchforinvitingmehere.It’sverypleasanttohaveachancetotalktoyouaboutsomethingt
A、Hecamebackthenextweekend.B、Ittookthem15hourstodrivealltogether.C、HespentagoodnightinMexico.D、Theyhadto
______allmyefforts,IwillnothavethereportreadybyFriday.
随机试题
下列公式中,正确的有()。
中国历史上首开人为造山之先河的是()。
A.丙酮酸B.谷氨酸C.α-酮戊二酸D.草酰乙酸E.甘氨酸(1995年)体内最广泛存在,活性最高的转氨酶是将氨基转移给
属于我国《刑事诉讼法》特有的基本原则之一的是()。
单击“演示文稿”按钮,然后按照题目要求完成下面的操作。注意:以下的文件必须保存在考生文件夹下。“天河二号超级计算机”是我国独立自主研制的超级计算机系统,2014年6月再登“全球超算500强”榜首,为祖国再次争得荣誉。作为北京市第××中学
Mergethefollowingtwoshortsentencesintoonenewsentence.
美国在1940年代崛起为军事和经济强国,他们在各个领域的卓越成就让东方人为之神往。话虽如此,美国人却又一次转向中国文化,以丰富他们的生活。这个趋势方兴未艾。
A、Indifference.B、Criticism.C、Hatred.D、Conservatism.B根据句(9)可知,自从快餐出现以来就饱受人们的诟病。因此答案为[B]。
Itdoesn’tcomeasasurprisetoyoutorealizethatitmakesnodifferencewhatyoureadorstudyifyoucan’trememberit.You
Onthenightoftheplay,Albertwasalreadymade-upand【B1】______inhispoliceman’suniformlongbeforetheendofthefirsta
最新回复
(
0
)