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
2024-03-13
69
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、By controlling the carriers of the disease.
B、By growing a stronger kind of the elm.
C、By watering infected elm trees.
D、By cutting down all infected elms.
答案
A
解析
细节题。根据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.可知科学家们要从根源上控制传播疾病的虫子。因此,正确答案是A。
转载请注明原文地址:https://tihaiku.com/zcyy/3529704.html
相关试题推荐
[originaltext]So,nowweareintheroomwithnaiveart,producedintheUni
[originaltext]Goodevening,IamSteveJohnsonandIrepresenttheAmerican
[originaltext]Goodevening,IamSteveJohnsonandIrepresenttheAmerican
[originaltext]Goodevening,IamSteveJohnsonandIrepresenttheAmerican
[originaltext]SummermeansinternshipsforthousandsofAmericancollegestu
[originaltext]SummermeansinternshipsforthousandsofAmericancollegestu
[originaltext]SummermeansinternshipsforthousandsofAmericancollegestu
[originaltext]SummermeansinternshipsforthousandsofAmericancollegestu
[originaltext]W:Wu,doyouhavetimetotellmemoreaboutthemultimediateac
[originaltext]W:Wu,doyouhavetimetotellmemoreaboutthemultimediateac
随机试题
WheredidMadonnahavetheridingaccident?[br][originaltext]Madonna,th
A.publishedB.demonstrateC.cutoffD.studiedE.investigatedF.sta
[audioFiles]audio_eusm_0101(20106)[/audioFiles]A、London.B、EastColchester.C、I
ThecolonyVirginiawasnamedafter_______.A、QueenElizabethB、QueenBloodMarr
[originaltext]Therecentincreaseincarstealinghasalarmedthepolicewho
《标准化法》将标准划分为四级,分别是()。A.国家标准 B.行业标准 C.
下列关于山茱萸的叙述错误的是A.归肝、肾、肺、脾经 B.性微温、味酸、涩 C
A.回流法B.渗漉法C.浸渍法D.水蒸气蒸馏法E.煎煮法可以同时得到药材中挥发性
在住宅项目价格制定过程中,合理的( )是确保价格实现的关键。A.市场调研 B
禁止在机器转动时,从联轴器(靠背轮)和齿轮上取下防护罩或其他防护设备。
最新回复
(
0
)