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
2023-08-10
71
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:http://tihaiku.com/zcyy/2913442.html
相关试题推荐
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStat
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStat
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStat
AmericansEugeneFama,LarsPeterHansenandRobertShillerwontheNobelPr
AmericansEugeneFama,LarsPeterHansenandRobertShillerwontheNobelPr
AmericansEugeneFama,LarsPeterHansenandRobertShillerwontheNobelPr
AmericansEugeneFama,LarsPeterHansenandRobertShillerwontheNobelPr
AmericansEugeneFama,LarsPeterHansenandRobertShillerwontheNobelPr
AmericansEugeneFama,LarsPeterHansenandRobertShillerwontheNobelPr
AmericansEugeneFama,LarsPeterHansenandRobertShillerwontheNobelPr
随机试题
[img]2017m4s/ct_etoeiclm_etoeiclzp_0101_20170401[/img][br][originaltext](A)Sh
Sinceyourcarneeds(clean)______,you’dbetterdoitrightnow.cleaning/tobe
[originaltext]W:AreyouallreadyforChristmas?M:Areyoukidding?(8)Ihaven
我国土地资源、森林资源、矿产资源的共同特点是(??)A.类型或种类单一 B.在
A.3004 B.7650 C.12017 D.24033
关于船舶规模经济的说法,错误的是()。A.当船舶吨位增大时,建造成本并不同
在用情景分析法预测流动性风险时,分析最坏情景通常包括()等情形。 Ⅰ.资产负债
封闭式基金的固定存续期通常()。 A.无固定期限B.在5年以上 C.在1
下列有关偏度和峰度的表述正确的有()。A.偏度用来度量随机变量概率分布的不
传统观点总把金钱看成最好的激励手段,但在很多企业中,增加同样的奖金并没有起到同等
最新回复
(
0
)