首页
登录
职称英语
[originaltext] (20)This coffee can contains soil from my garden. And I prep
[originaltext] (20)This coffee can contains soil from my garden. And I prep
游客
2024-04-11
30
管理
问题
(20)This coffee can contains soil from my garden. And I prepared slide samples to show you that it is alive. This ordinary backyard dirt is crawling with microbes.(22)Microbes are not a very specific term. There are hundreds of thousands of different species called microbes. What they have in common is that we can’t see them with a naked eye. They are microscopic. Look at this slide. You should see some round cells. Those are yeasts.(21)Yeasts are fermenters. And they are necessary for making bread, beer, yogurt and so forth. Now look for an irregular shape with hairs coming out of it. That’s a mold. Molds are decomposers . and they are responsible for the decomposition mycoplastlees. You should also see some protozoa. Some protozoa, like the one causes malaria are harmful to people. A microbic that causes disease is called a pathogen. Finally you should see a lot of squiggly lines. They are bacteria—the oldest form of life on earth. Like these other microbes, bacteria are single-cells. But they are even simpler structurally because their cells do not have nuclear. So I’ve got about a teaspoon of soil in my hand here. In that teaspoon are about ten thousand protozoa, 200 thousand mold cells, a million yeasts, and probably a billion bacteria.
20. Why did the speaker take a soil sample from his garden?
21. What does the speaker imply about yeasts?
22. What does the speaker ask the class to look at during the talk?
选项
A、A photograph of his garden.
B、Microscope slides.
C、Drawings of microbes.
D、A chart of soil components.
答案
B
解析
由“Microbes is not a very specif-ic term.There are hundreds of thousands of different species called microbes.What they havein common is that we can’t see them with a naked eye.They are microscopic.Look at thisslide.”可知讲话者让大家观看的应该是一个显微镜载片。
转载请注明原文地址:https://tihaiku.com/zcyy/3551111.html
相关试题推荐
[originaltext]ItisbarelyhalfacenturysincepartsoftheThameswerede
[originaltext]ItisbarelyhalfacenturysincepartsoftheThameswerede
[originaltext]ItisbarelyhalfacenturysincepartsoftheThameswerede
[originaltext]Justwatchinganotherpersonshivercancauseourowntempera
[originaltext]W:Jackie,youlookfantastic.Isityogathathelpsyourecover
[originaltext]M:Lerato,IheardthatyouarefromSouthAfrica.WhatpartofS
[originaltext]M:Lerato,IheardthatyouarefromSouthAfrica.WhatpartofS
[originaltext]M:Ms.Lincoln,I’myourtenant,Joe.Ican’tgetconnectedonlin
[originaltext]M:Ms.Lincoln,I’myourtenant,Joe.Ican’tgetconnectedonlin
[originaltext]M:Ms.Lincoln,I’myourtenant,Joe.Ican’tgetconnectedonlin
随机试题
HowtoCreateaHomeLibrary"Icannotlivewithout
Forpeoplesufferingfromdepression,theadviceisusuallythesame:seekh
下列属于同业拆借特征的有()。A.手续简便 B.通常无抵押或担保 C.金
患者,女,45岁,消化性溃疡反复发作10年,剧烈腹痛突然发作3小时,全腹压痛、反
2010年,我国预算内财政收入为83080亿元,从中央预算稳定调节基金调入100
对有经验的规划人员,建筑群的范围、建成区和非建成区的界线、郊区农田和市内绿地等等
采用成本领先战略的企业适宜采用的绩效考核方法是()。A.平衡计分卡法 B.
(2016年真题)下列关于绩效管理的说法,错误的是()。A.绩效管理是一个完整
(2018年真题)在填写票据出票日期时,“10月20日”应写成“壹拾月零贰拾日”
骨折治疗原则中的首要步骤是( )。A.功能锻炼 B.内固定 C.复位 D
最新回复
(
0
)