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
26
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 Molecules move so rapidly that within a tenth of a second the molecules around a bacterium have all been replaced by new ones; even bacteria without flagella are thus constantly exposed to a changing environment.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
B
解析
转载请注明原文地址:https://kaotiyun.com/show/P2VK777K
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
PassageTwoWheredidthelanguageinwhicheachsign,orletterrepresentedonlyonesoundoriginate?
Surprisingly,nooneknowshowmanychildrenreceiveeducationinEnglishhospitals,stilllessthecontentorqualityofthate
RichAmericansarewillingtotakeconspicuousconsumptiontonewheightsbyspendingbigbuckstoflyintospace,includingpay
Informationistheprimarycommodityinmoreandmoreindustriestoday.By2005,83%ofAmericanmanagementpersonnelwillb
(1)Therewillbenovaledictoryspeech(毕业致辞)atJerichoHighSchool’sgraduationonSunday.Withsevenseniorslayingclaimto
PassageThreeWhatdoestheauthormeanby"eatingjustonthelightersideofwhatIreallyneed"?
Vibrationsinthegroundareapoorlyunderstoodbutprobablywidespreadmeansofcommunicationbetweenanimals.Itseems【C1
ConsideringhowjazzistranscribedinChinese(jueshi),youmaybe【C1】________intoassumingthatitisanaristocraticcultura
(1)Thehealthyadolescentboyorgirllikestodotherealthingsinlife,todothethingsthatmatter.Hewouldratherbeap
"Additionalsocialstressesmayalsooccurbecauseoftheproblemarisingfrommassmigrationmovements"hasallthefollowingp
随机试题
列管换热器中下列流体宜走壳程的是()。
在学习民歌的基础上,创造并发展了“楚辞”这一新的诗歌样式的诗人是屈原。()
患者,慢性肾炎5年,长期低盐低蛋白饮食,乏力、恶心、呕吐20天。血压140/100mmHg,无水肿,Hb60g/L,尿蛋白(+),颗粒管型0~3个/HP,血白蛋白30g/L,球蛋白25g/L,BUN20mmol/L,血Cr1220~mol/L,血钠125m
滤过膜,也叫血尿屏障,是血液滤过形成原尿的结构,下列哪些结构是血液依次滤过的
建设工程项目投资控制的最高限额是指经批准的()。
商业银行下列做法错误的是()。
2013年,重庆市房地产开发企业完成投资突破3000亿大关,达3012.78亿元,同比增长20.1%,较一季度回落5.2个百分点,比上半年回落7.6个百分点,比前三季度回落0.5个百分点。截至12月月底,全市商品房施工面积26251.89万
2008年1至3月份,福建沿海地区与台湾地区海上客运直航船舶的公司共运营2425航次,共运送旅客188648人次,分别为2007年同期的108%、97%:其中,大陆5家船舶公司经营的7艘客船共运营1190航次,运送旅客96017人次。台湾6家船舶公司经营的
某二叉树共有7个结点,其中叶子结点只有1个,则该二叉树的深度为(假设根结点在第1层)( )。
Whichofthefollowingitalicizedpartsisusedasasubjectcomplement?
最新回复
(
0
)