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
3
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://www.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
关于屋面卷材防水工程出屋面管道处的施工质量控制应符合的规定,下列说法错误的是(
空腔脏器破裂A.局限性腹壁痛、肿痛和压痛、皮下淤斑B.休克、明显腹胀和移动性浊音
在静态网页中,网站管理员更新了网页内容,用户如果想要查看最新的内容则需要在IE浏
信息本身的()是指人们通过声音、文字、图像或者动作相互沟通消息。A.可再生性
下列原因中,不能据以调整设计概算的是( )。A.超出原设计范围的重大变更 B.
初产妇活跃期延长是指活跃期超过A.4小时 B.6小时 C.8小时 D.10
以下"助消化药使用注意事项"的叙述中,正确的是A.送服时不宜用热水 B.应置于
下列不属于金融工具的有()。A.普通股股票 B.预付账款 C.债权投资
某企业在生产经营过程中发生了死亡9人的生产安全事故。按照《生产安全事故报告和调查
下列关于室内混凝土垫层的设置不符合要求的是()。A.地面的水泥混凝土垫层应
最新回复
(
0
)