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
11
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/3542955.html
相关试题推荐
[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
[originaltext]WeonlyhaveafewminutesleftsoI’dliketogooveracoup
随机试题
Rob8app,27,fromKent,lovedgameswhenhewasattendingschool.Infact,
DothefollowingstatementsagreewiththeviewsofthewriterinReadingPassag
______thefinalexaminationisover,wecangooutsideforapicnic.A、Eventhoug
D
下列选项中,正确表述认识的主体和客体之间的关系的有()A.改造与被改造的实践关系
结构化综合布线系统中的干线子系统是指(),水平子系统是指()。A.管
砂浆强度等级立方体试件的边长是()mm。A、70 B、70.2 C、70.5
速动资产通常简化处理为流动资产减存货,其不包括存货的原因是()。A.存货数量少
1905年至1907年,以孙中山为代表的革命派和以康有为为代表的改良派,分别以《
1999年11月4日,美国国会通过(),标志着金融业分业经营制度的终结A:《金融
最新回复
(
0
)