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
2023-10-19
55
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 Molecules move so rapidly that within a tenth of a second the molecules around a bacterium have all been replaced by new ones; even bacteria without flagella are thus constantly exposed to a changing environment.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
F
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3111542.html
相关试题推荐
Theartististhecreatorofbeautifulthings.Torevealartand【C1】____
Theartististhecreatorofbeautifulthings.Torevealartand【C1】____
Theartististhecreatorofbeautifulthings.Torevealartand【C1】____
Theartististhecreatorofbeautifulthings.Torevealartand【C1】____
The"standardofliving"ofanycountrymeanstheaverageperson’s【C1】______
The"standardofliving"ofanycountrymeanstheaverageperson’s【C1】______
The"standardofliving"ofanycountrymeanstheaverageperson’s【C1】______
The"standardofliving"ofanycountrymeanstheaverageperson’s【C1】______
The"standardofliving"ofanycountrymeanstheaverageperson’s【C1】______
The"standardofliving"ofanycountrymeanstheaverageperson’s【C1】______
随机试题
Electroniccigarettesarehandheldnicotine-deliverydevicesthat,despitea
[originaltext]Agrowingnumberofwomenaredevelopingsomethingcalleda“comp
水利部每年确定项目后评价年度计划后,项目管理单位应在后评价年度计划下达后(
牙周组织包括A.牙釉质 B.牙本质 C.牙槽骨 D.牙周膜 E.牙龈
试回答突起路标检验项目的问题。(2)突起路标出厂检验必检项目为()。A.外
病变在骨折处,多由于开放性骨折术后感染所致的是( )。A.创伤后骨髓炎 B.
(2018年真题)使用肝素静脉滴注期间需监测的指标是( )A.ALT B.A
以被保险人死亡为给付保险金条件的合同,如果保险合同届满2年后,被保险人自杀的,保
制定吊装技术方案时,应考虑起重机的基本参数有()A、额定起重量B、最大起升高度
企业获得的捐赠利得应该记入营业外收入中,影响利润总额。()
最新回复
(
0
)