首页
登录
职称英语
[originaltext] Good evening, I am Steve Johnson and I represent the American
[originaltext] Good evening, I am Steve Johnson and I represent the American
游客
2024-04-06
13
管理
问题
Good evening, I am Steve Johnson and I represent the American Elm Society. Today I’d like to introduce you to some of the problems faced by elm trees. Many of you are familiar with this huge tree. It’s found in many areas of US and Canada in cities and small towns. Well, as you may know, the American elm has been threatened by a dangerous disease. The disease is caused by a fungus, when that fungus infects the tree, it blocks the circulation of water inside the tree. As a result, the tree cells don’t receive water and without water, of course they can’t survive. The tree’s leaves become dry, fall off, and eventually the tree dies. You may be interested in how the disease is transmitted, well, a very small insect called elm bug beetle brings the fungus with it. The beetle uses the tree to reproduce itself. The female builds channels in the wood for the eggs, at the same time, it infects the tree with fungus. The worst thing is that the process seems unstoppable, because once the beetle leaves the infected tree it carries the fungus on its body and poisons a healthy tree. Of course, we are trying to fight the disease, in the past, infected trees were simply cut down. That method reduces the number of the infected trees but it never stop the disease. Now experts are trying to get to the root of the problem, they are working on ways to control the beetle that spreads the disease.
Now listen to the following recording and answer questions 16 to 18.
16. What is causing the death of the infected elm trees?
17. According to the speaker, what causes the healthy elm tree to become weak?
18. According to the speaker, how do experts hope to limit the spread of the disease in the future?
选项
A、It is damaged by extremely dry weather.
B、It loses water to stronger trees.
C、Insects destroy the tree’ s bark.
D、Certain beetles introduce a fungus to the tree.
答案
D
解析
细节题。根据You may be interested in how the disease is transmitted,well,a very small insect called elm bug beetle brings the fungus with it.可知榆树的疾病是由一种小昆虫传播的。因此,正确答案是D。
转载请注明原文地址:https://tihaiku.com/zcyy/3542954.html
相关试题推荐
[originaltext]Thereareseveralwaysyoucanfindoutaboutthecountriesan
[originaltext]Thereareseveralwaysyoucanfindoutaboutthecountriesan
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]M:IsupposethatinBritain,too,familylifehaschangedalot
[originaltext]M:IsupposethatinBritain,too,familylifehaschangedalot
[originaltext]Today,wearegoingtocontinueourdiscussionofsocialinse
[originaltext]Today,wearegoingtocontinueourdiscussionofsocialinse
[originaltext]Someofthemostpracticallessonscomingoutofresearchin
[originaltext]Someofthemostpracticallessonscomingoutofresearchin
随机试题
ThanksgivingDayisthemosttrulyAmericanofthenationalholidaysinthe
MemoDate:March30,2005To:JohnSmithFrom:
阅读以下关于成本管理的叙述,回答问题1至问题3,将解答填入答题纸的对应栏内。
行业协会往往规定所有成员必须遵守的职业道德规范。行业协会建立职业道德规范的主要目
阅读材料,回答问题。 随着我国社会转型加快,社会结构日益复杂,社会管理面临新的
十字路口的交通信号灯每分钟红灯亮30秒、绿灯亮25秒,黄灯亮5秒。当你抬头看信号
互换中最常见也最重要的是利率互换和货币互换。( )
按照我国《货币市场基金监督管理办法》,货币市场基金可以投资的金融工具是()
下列关于设备找平的正确说法是()。A.在设备精加工面上选择测点,用水平尺进
溶栓治疗药物() A.rt-PA B.低分子肝素 C.阿司匹林 D.降纤
最新回复
(
0
)