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 Molecules move so rapidly that within a tenth of a second the molecules around a bacterium have all been replaced by new ones; even bacteria without flagella are thus constantly exposed to a changing environment.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
G
解析
转载请注明原文地址:https://kaotiyun.com/show/U2VK777K
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)Therewillbenovaledictoryspeech(毕业致辞)atJerichoHighSchool’sgraduationonSunday.Withsevenseniorslayingclaimto
(1)YellowstoneNationalParkisinthewesternstateofWyoming.Itisoneofthemostunusualplacesintheworld.Extremelyho
(1)Theideaofcreatingasystemthatallowstheunderprivilegedtheopportunitytobreakthecycleandachievesomethingispra
Theartististhecreatorofbeautifulthings.Torevealartand【C1】________theartistisart’saim.Thecriticishewhoc
Vibrationsinthegroundareapoorlyunderstoodbutprobablywidespreadmeansofcommunicationbetweenanimals.Itseems【C1
Weighingtoomuchcandamageone’shealth,andobesityisagrowingproblemforbothkidsandadultsaroundtheworld.【T1】______
IceCreamIcecreamisafrozendessertusuallymadefromdairyproducts,suchasmilkandcream.Mostcurrentvarietiescon
She______thearticlebyFriday,andshewillemailittome.
Accordingtoanewschoolofscientists,technologyhasbeenoverlookedasaforceinexpandingthehorizonsofscientificknowl
—Isupposewecouldwalkorcycletothepool-it’snotthatfar.—Yes,butit’ssohotwe’llbeexhaustedbythetimewegett
随机试题
元代的山水画四大家包括()。
具体行政行为必须同时具备三项标准能被认为是合法的()。
中国特色社会主义进入新时代,在()上都具有重大意义。
Weare______attherapidprogressMarkhasmadeinthissemester.
细胞膜内外正常钠和钾浓度差的形成和维持是由于(1996年,1998年,2004年)
通运货物由()向海关办理报关手续。
公司职工取得的用于购买企业国有股权的劳动分红,应按照( )项目征收个人所得税。
下列关于固定汇率制下,财政政策的有效性的描述中,正确的是()
SingingAlarmsCouldSavetheBlindIfyoucannotsee,youmaynotbeabletofindyourwayoutofaburningbuilding--andtha
Mostpeopleareawarethatoutdoorairpollutioncandamagetheirhealth,butmanydonotknowthatindoorairpollutionalsoca
最新回复
(
0
)