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
68
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、Their inability to circulate water.
B、Their increased sensitivity to heat.
C、Low reproductive rates.
D、Heavy pollution in the atmosphere.
答案
A
解析
细节题。根据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.可知水分无法循环造成了榆木的死亡。因此,正确答案是A。
转载请注明原文地址:https://tihaiku.com/zcyy/2920918.html
相关试题推荐
[originaltext]Yourprofessorhasaskedmetotalktoyoutodayaboutthetop
[originaltext]Yourprofessorhasaskedmetotalktoyoutodayaboutthetop
[originaltext]Ok,soinourlastclasswewerediscussingbigbandsswingmu
[originaltext]Ok,soinourlastclasswewerediscussingbigbandsswingmu
[originaltext]We’vebeenlookingatfearfrombiologicalperspective.Andso
[originaltext]We’vebeenlookingatfearfrombiologicalperspective.Andso
[originaltext]Humanbeingshavelivedonthisearthforatleasttwomillion
[originaltext]TexaswasthebiggeststatebeforeAlaskabecametheforty-nin
[originaltext]TexaswasthebiggeststatebeforeAlaskabecametheforty-nin
[originaltext]W:Whatanice,quietspotawayfromallthosepeople.Nowtellm
随机试题
WhenIfirstentereduniversity,myaunt,whoisanEnglishprofessor,gave
TheworkforwhichThomasMalthusisstillmostwidelyknownishisEssayon
Writingisnotaneasyskill.Itisbothmentalandphysical.Apersonmust
Completethenotesbelow.WriteONEWORDAND/ORANUMBERforeachanswer.DRIVIN
WhatmightbeindangerbecauseofthecrisisinKenyaaccordingtothenewsite
某研究者认为手机依赖会影响学业情况,进而产生学业倦怠。于是他编制了大学生手机依赖
同一中药其产地不同,主要影响中药的A:基原B:内在品质C:炮制方法D:服用
以县级行政区域为单位,人均耕地超过2亩、不超过3亩的地区,每平方米征收()元。A
某女性患者,缺失,深龋,已行根管治疗,现行修复,粘结固定桥最常用的水门汀是A.氧
2010年1月1日,甲公司购入乙公司于2009年1月1日发行的面值2000万元、
最新回复
(
0
)