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
2023-08-16
21
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. Manyof 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 elmbug 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/2930852.html
相关试题推荐
[originaltext]W:Whatanice,quietspotawayfromallthosepeople.Nowtellm
[originaltext]W:Whatanice,quietspotawayfromallthosepeople.Nowtellm
[originaltext]M:Hello.W:Hello,Sam.ThisisPaulaHandson.Sorrytobothery
[originaltext]M:Hello.W:Hello,Sam.ThisisPaulaHandson.Sorrytobothery
[originaltext]Thefocusoftoday’sclassisonanimportantelementinthe
[originaltext]Thefocusoftoday’sclassisonanimportantelementinthe
[originaltext]Goodevening,IamSteveJohnsonandIrepresenttheAmerican
[originaltext]Goodevening,IamSteveJohnsonandIrepresenttheAmerican
[originaltext]AnewenemyisthreateningJapanesetraditions:leisure.Asp
[originaltext]AnewenemyisthreateningJapanesetraditions:leisure.Asp
随机试题
[originaltext]W:OurPresident,sinceleavingofficefiveyearsago,hasspent
CouldFoodShortagesBring
交叉编译器软件属于嵌入式系统的()。A.系统软件 B.应用软
引起上消化道出血最常见的原因是A.食管胃底静脉曲张破裂出血 B.胃、十二指肠溃
以下关于新生儿用药的特点,正确的是A.药物经皮吸引较成人慢 B.药物半衰期短
属于器官移植慢性排斥反应的特点是()。A.术后l~2周发生 B.术后24小时
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
某村为新农村规划建设试点村。该村位于城市边缘,所处地区由于城市整体生态环境需要而
(2015年真题)患者因扁桃体炎给予头孢拉定治疗,服用4个小时后,面部出现皮疹,
(2017年真题)关于劳动者应当承担的违反劳动法律责任的说法,正确的是()
最新回复
(
0
)