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
2024-04-02
3
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:https://tihaiku.com/zcyy/3537180.html
相关试题推荐
[originaltext]AsIamsureyouareaware,historyisfullofpeoplewhower
[originaltext]I’vementionedhowDNAhavesolvedmanymysteriesinbiology
[originaltext]I’vementionedhowDNAhavesolvedmanymysteriesinbiology
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Notonlyd
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Notonlyd
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Notonlyd
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Notonlyd
[originaltext]Howoftenonehearschildrenwishingtheyweregrown-ups,and
[originaltext]Howoftenonehearschildrenwishingtheyweregrown-ups,and
[originaltext]W:Whatanice,quietspotawayfromallthosepeople.Nowtellm
随机试题
[originaltext]W:Nowpeoplearesufferingmorestress,especiallywomen.Iwo
Inhisyouth,KnuteAxelbrodwantedtolearnmanylanguages,toknoweveryth
深龋患者激发痛较重,洞底软龋能够彻底去净,治疗方法应选择()A.双层
狼疮性肾炎一般不表现为()A.肾病综合征 B.肾盂肾炎 C.急性肾炎
运动可使糖皮质激素水平升高,以调节能量,供应该分泌该激素的器官是()。A.脑
下列有关固定资产业务的内部控制措施中,有效的预防性控制措施是()。A.固定资产使
服用2~6个月内可能有较严重的视神经炎的不良反应的药物是A.异烟肼B.利福平C.
(2020年真题)下列各项中,会计师事务所在执行员工业绩评价时,应当作为首要考虑
根据《水电站工程验收管理办法》,下列不属于水电工程阶段验收的是()。A.工程截流
参与转氨基的维生素是A、维生素B1 B、维生素B6 C、维生素PP D、叶
最新回复
(
0
)