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
51
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
•Readthearticlebelowaboutthestudyincareerchange.•Inmostoftheline
Theyhavelonghadtodealwithaseriesoffaultsandviruses.【D1】______now
Chinashouldlosenotime(catch)______upwiththedevelopedcountries.catchin
Thesetwoapplesareforyou.Therest_
不属于ISO9000族标准的基本要求()。A.过程控制的出发点是预防不合格
击实是指采用人工或机械对土施加夯压能量(如打夯、碾压、振动碾压等方式),使土颗粒
为有效抑制多路径效应的影响,GNSS基准站接收机天线应具备的特性或特定设备是
(2022年真题)王女士因遭受丈夫家暴,向社会工作者小华求助,在个案服务的第七次
若上市公司以股东财富最大化作为财务管理目标,则衡量股东财富大小的最直观的指标是(
根据相关标准要求,监理单位可根据管理需求,确定是否编制程序文件,其内容与数量由监
最新回复
(
0
)