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
2023-08-12
55
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:http://tihaiku.com/zcyy/2920920.html
相关试题推荐
[originaltext]Narrator:ListentopartofalectureinaBiologyclass.Pr
[originaltext]Fast-foodrestaurantsareverypopularintheUnitedStates.
[originaltext]Fast-foodrestaurantsareverypopularintheUnitedStates.
[originaltext]Fast-foodrestaurantsareverypopularintheUnitedStates.
[originaltext]Fast-foodrestaurantsareverypopularintheUnitedStates.
[originaltext]Sowe’vealreadytalkedabitaboutthegrowthofextremespo
[originaltext]Sowe’vealreadytalkedabitaboutthegrowthofextremespo
[originaltext]W:I’vebeenreadingaboutanewhealthysnackfood.It’smadefr
[originaltext]W:Goodmorning,Chuck,areyoualsoherewaitingforProfessorJ
[originaltext]W:Goodmorning,Chuck,areyoualsoherewaitingforProfessorJ
随机试题
Accordingtothelatestnews,______(篮球比赛不得不推迟)untilnextweek.thebasketballmat
Itwasno______thathiscarwasseennearthebankatthetimeofrobbery.A、coin
[originaltext]W:Itseemssomethingisweighingonyourmindthesedays.What’s
文学话语是一种社会性话语()
单层细砂滤料滤池用水反冲洗时处于流态化状态后,若再增加反冲洗强度,以下有关滤层膨
动脉导管未闭患儿临床典型表现为A.肺动脉段突出 B.缺氧发作 C.周围血管征
在角膜组织中,没有细胞成分的是A.上皮层 B.前弹力层 C.实质层 D.后
残疾军人张某退役后被安置在甲县某事业单位工作,根据《中华人民共和国退役军人保障法
环境中常见的二次污染物如A.二]英和甲基汞 B.SO和NO C.多环芳烃和二
某燃煤火电厂脱硫系统入口SO2浓度为3500mg/Nm3,脱硫系统出口SO2浓度
最新回复
(
0
)