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
2023-08-17
58
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、To show how common microbes are.
B、To prove how well his gardening methods work.
C、To provide an example of an uncommon mold.
D、To diagnose why his plants are sick.
答案
A
解析
由“This coffee can contains soilfrom my garden.And I prepared slide samplesto show you that it is alive.”可知讲话者带泥土来的原因是为了让大家观察微生物的情况。
转载请注明原文地址:https://tihaiku.com/zcyy/2934849.html
相关试题推荐
[originaltext]W:Thankyou,thankyouandwelcometoeveryone’sfavoritegames
[originaltext]W:Thankyou,thankyouandwelcometoeveryone’sfavoritegames
[originaltext]W:Hmm,hi.M:Hi,Iamgoingdoortodoortonighttotellpeople
[originaltext]M:IfIeverseethatguyagain,I’mdefinitelygoingtotellhim
[originaltext]M:IfIeverseethatguyagain,I’mdefinitelygoingtotellhim
[originaltext]M:IfIeverseethatguyagain,I’mdefinitelygoingtotellhim
[originaltext]WhenMidoriwastwoyearsold,sheoftenclimbedontothepia
[originaltext]WhenMidoriwastwoyearsold,sheoftenclimbedontothepia
[originaltext]WhenMidoriwastwoyearsold,sheoftenclimbedontothepia
[originaltext]Theprivatemotorvehiclehasgivenusafreedomourancestor
随机试题
[originaltext]W:Here’sanadforanapartmentwithtwobedrooms.It’snearthe
Inthesentence"Hefeelsitdifficulttoconvincehisson",theitalicizedphr
根据血浆纤溶酶原活化抑制物活性检测发色底物法测定原理,该项目的单位应为A:标准单
以下哪个选项不是我国现代作曲家冼星海的作品?()A.《黄河》 B.《到敌
人防工程是的采光窗井与相邻一类高层民用建筑主题出入口的最小防火间距是()mA.6
(2021年真题)钱女士把刚退休的母亲从千里之外的老家接到自己生活的城市,请她帮
简述教育的公共性原则。
以百会、风池为主方可以治疗的病症有A.外感头痛 B.内伤头痛 C.眩晕实证
下列关于房产税的有关规定中,正确的有()。A.对于需经常更换的房屋附属设备中的零
CO中毒时下列哪项是不正确的?( )A.老人和孩子易患 B.老人应与脑血管意
最新回复
(
0
)