首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、It is damaged by extremely dry weather. B、It loses water to stronger trees. C、Insects destroy the tree’ s bark. D、Certain beet
A、It is damaged by extremely dry weather. B、It loses water to stronger trees. C、Insects destroy the tree’ s bark. D、Certain beet
admin
2018-02-13
67
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、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 elm bug 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://kaotiyun.com/show/aLT7777K
0
大学英语六级
相关试题推荐
A、Becausethestudentshavetopassallexaminationsbeforeenteringit.B、Becausethereisnoexaminationbeforetheyareaccep
A、In1890s.B、In1923.C、Intheearly1920s.D、In1903.C细节题。文中最后一段提到:但是直到20世纪20年代初期,一个有效的声音系统才被开发出来。所以正确答案为C。
A、Becausetheycan’taffordto.B、Becausetheythinksmallhousesaremorecomfortabletolivein.C、Becausebighousesareusua
A、Becausetheyarepoor.B、Becausetheyareintroublewiththelaw.C、Becauseconditionsfavoredtheoldlifearegoneforever.
A、Redwoodtrees.B、Forestfires.C、SanFrancisco.D、Survivalskills.A主旨题。对话中出现频率最高的词是redwoodtrees,而且对话中通篇都在讲旧金山沿海的红杉树,讲到其高度、历史
A、Youneedalotofmoneytostartthebusiness.B、Youngostrichesareveryindependent.C、Ostrichesarealwaysshutincages.D
A、Thecostofgrowingtobaccoincreased.B、Manypeoplebegantogiveupsmoking.C、Thegovernmentbannedsmokingandcigarette.
Widespreadadoptionofplug-inelectricvehiclescoulddramaticallycutgreenhousegaspollutionandreduceU.S.dependenceonf
A、Reasonsforincreasedproductivity.B、Howwristwatchesaremanufactured.C、TheindustrializationoftheUnitedStates.D、The
随机试题
学校教学与行政管理由()负责。
A.攒竹B.委阳C.承山D.天枢E.昆仑
项目式组织结构的优点包括()。
A公司从那些由于经常乘坐B航空公司的飞机而得到B航空公司奖励票券的人们那里买来了一些免费旅行票券,将这些票券以低于从B航空公司购买机票的价格向人们出售。这种票券的市场交易导致了B航空公司的收入损失。为抑制这种免费旅行票券的买卖行为,对B航空公司来说最好的做
领导者若位高权重,要提高领导效能应注意()。
下列说法正确的是______。
一个人去面试.问他会不会开车,他下意识地回答会。但他从来没开过车。他只有四天时间,从买车到开始学开车.然后第四天开到了面试的公司,问你怎,厶看待这件事情?
Whichofthefollowingstatementsistrueaccordingtotheauthor?What’stheevidencethatJacksonthoughtKobeisbetterthan
在考生文件夹下XILIE文件夹中创建名为BTNBQ的文件夹,并设置为隐藏属性。
A、Bytakingacourse.B、Verywell.C、Inthemorning.A
最新回复
(
0
)