首页
登录
职称英语
Bacteria are extremely small living things. While we measure our own sizes i
Bacteria are extremely small living things. While we measure our own sizes i
游客
2024-08-19
8
管理
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 Molecules move so rapidly that within a tenth of a second the molecules around a bacterium have all been replaced by new ones; even bacteria without flagella are thus constantly exposed to a changing environment.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. [br]
选项
答案
E
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3726108.html
相关试题推荐
Ifthereisanysingle【21】thatmakesforsuccessinliving,itistheabilit
Ifthereisanysingle【21】thatmakesforsuccessinliving,itistheabilit
Ifthereisanysingle【21】thatmakesforsuccessinliving,itistheabilit
Ifthereisanysingle【21】thatmakesforsuccessinliving,itistheabilit
Ifthereisanysingle【21】thatmakesforsuccessinliving,itistheabilit
Bacteriaareextremelysmalllivingthings.Whilewemeasureourownsizesi
Bacteriaareextremelysmalllivingthings.Whilewemeasureourownsizesi
Bacteriaareextremelysmalllivingthings.Whilewemeasureourownsizesi
Bacteriaareextremelysmalllivingthings.Whilewemeasureourownsizesi
Bacteriaareextremelysmalllivingthings.Whilewemeasureourownsizesi
随机试题
______wasoneoftheFoundingFathersoftheUnitedStates,arenownedmanofle
[originaltext]W:Hasyourbrotherfoundanapartmentyet?M;No,he’sstillliv
关于钻孔灌浆与锚固工程工程量的计算,下列说法错误的有( )。A.地下工程的固结
黄某2001年10月因医疗事故受到吊销医师执业证书的行政处罚,2002年9月向当
若曲线y=x2的一条切线Z与直线x+6y-3=0垂直,则2的方程为()A.6x
对强心苷中毒引起的重症快速性心律失常疗效最好的药物是A:普萘洛尔 B:维拉帕米
右侧颞下颌关节开口初发出单音清脆弹响,开口型先偏向右侧,弹响发生后又回到中线。关
下列关于行政许可的变更与延续的说法中,正确的是( )。A.行政许可的延续需在有效
当银行融资和用资的到期日不匹配时,可能产生()。A:法律风险 B:流动性风险
下列建设工程施工合同的风险中,属于项目组织成员资信和能力风险的是()。A.
最新回复
(
0
)