首页
登录
职称英语
[originaltext] A beetle invasion in the United States has killed at least tw
[originaltext] A beetle invasion in the United States has killed at least tw
游客
2024-04-15
20
管理
问题
A beetle invasion in the United States has killed at least twenty million ash trees. The invasion of the emerald ash borer was first discovered near Detroit, Michigan, in 2002. Experts believe the small green insects arrived in the 1990’s in shipments of goods from China.
The emerald ash borer has destroyed trees in the Midwest and as Far East in the United States as Maryland. [19]The insects have also spread as far north as Ontario, Canada.
Ash trees can resist many diseases. But they cannot resist the emerald ash borer. It lays eggs on the bark. The young larva drill into and feed on the inner bark. This harms the ability of the tree to transport water and nutrition.
In some places, farmers are using "detection trees". They have an area where bark has been cut away. The area circles the tree. The process weakens the tree. It makes them easier targets for borers, and shows if the insects are nearby.
Efforts to stop the spread of the emerald ash borer include cutting down affected trees. There are worries that the ash tree might disappear unless the invasion is controlled. To prepare for such a possibility, a government laboratory is asking people to send in the seeds from ash trees. [21]It examines and x-rays the seeds to make sure there are no living borer fertilized eggs. Only the best seeds are remained and then sent for storage in a seed bank. There, they are dried and frozen. Should the seeds ever be needed, the hope is that scientists might someday develop an ash tree that could resist the little green attackers.
19. How far do the insects spread northward?
20. Why is part of the bark cut away?
21. What is the government laboratory trying to do?
选项
A、To Michigan.
B、To China.
C、To Maryland.
D、To Canada.
答案
D
解析
短文说,钻孔虫向北扩散至Ontario,Canada。故D是正确答案。四个选项是地名,可猜测题目与地点有关。A和C是美国的州名,B和D是国家名,边听边做好笔记。解题的关键在于听清楚问题,就可以对号入座找出正确的答案了。
转载请注明原文地址:https://tihaiku.com/zcyy/3556149.html
相关试题推荐
[originaltext]Tobeaddictedtocigarettesmeansthatyourbodycomestoneedt
[originaltext](16)Lionsprefertoeatwithouthavingtodomuchwork.Whenres
[originaltext]M:Hello,Miss.Whatbringsyouheretoday?W:(13)Iamnotfeel
[originaltext]M:Hello,Miss.Whatbringsyouheretoday?W:(13)Iamnotfeel
[originaltext]M:Hello,Miss.Whatbringsyouheretoday?W:(13)Iamnotfeel
[originaltext]W:Hi.M:Hi,I’mgoingdoortodoortonighttotellpeopleabout
[originaltext]W:IheardMarilyn’sgoingtocollege.What’sshestudying?M:Sh
[originaltext]W:IheardMarilyn’sgoingtocollege.What’sshestudying?M:Sh
[originaltext]W:IheardMarilyn’sgoingtocollege.What’sshestudying?M:Sh
[originaltext]W:IheardMarilyn’sgoingtocollege.What’sshestudying?M:Sh
随机试题
Tim
Inspring,chickensstartlayingagain,bringingawelcomesourceofprotein
UsefulInformationaboutBeijingClimateandClothingAug
对某一流段,设其上、下游两断面1-1、2-2的断面面积分别为A1、A2,断面流速
A.牛乳培养基中"汹涌发酵" B.能产生毒性最强的毒素 C.能引起机体强直性
在人力资源管理组织规划中,与潜在任职者相关的信息包括()。A:个人品质因素
采用成本法估价时,关于投资利息的表述中,正确的是( )。A.投资利息指的是借款部
(2017年5月)关于胜任特征模型,下列说法正确的有()A.盒型胜任特征模型主要
同一动产上已设立抵押权或者质权,该动产又被留置的,留置权无效。()
谨慎性要求会计人员在选择会计处理方法时( )。A、不高估资产和收益 B、不低估
最新回复
(
0
)