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
2023-08-17
41
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. Experts believe the small green insects arrived in the 1990’s in shipments of goods from East Asia.
The emerald ash borer has destroyed trees in the Midwest and as Far East in the United States as Maryland. 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. 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.
9. How did the emerald ash borers go to the United States according to experts?
10. How far do the insects spread northward?
11. Why is part of the bark cut away?
12. What is the government laboratory trying to do?
选项
A、Collect ash tree seeds for experiment.
B、Preserve the healthy ash tree seeds.
C、Set up a new seed bank for research.
D、Develop a new breed of ash tree.
答案
B
解析
选项均以动词原形开头,可以初步猜测题目与行动、建议或措施有关。短文说,实验室对种子进行检查和照X光射线,确保没有白蜡虫的受精卵,只有最好的才被保存起来。故答案是B。
转载请注明原文地址:https://tihaiku.com/zcyy/2934746.html
相关试题推荐
[originaltext]Thewintergift-givingseasonisresponsiblefortwentyperce
[originaltext]W:Sam,couldyoureviewtheresultsofthesurveyonleisurespo
[originaltext]W:Sam,couldyoureviewtheresultsofthesurveyonleisurespo
[originaltext]W:Hey,Mike!DidyouattendMr.Johnson’sseminarontheHistory
[originaltext]W:Hey,Mike!DidyouattendMr.Johnson’sseminarontheHistory
[originaltext]M:Hello,Mary.ThisisPeteratthehospital.IsMichaelhome?W
[originaltext]M:Hello,Mary.ThisisPeteratthehospital.IsMichaelhome?W
[originaltext]M:Hello,Mary.ThisisPeteratthehospital.IsMichaelhome?W
[originaltext]Asaresultofrisinguniversitycosts,manystudentsarefin
[originaltext]Asaresultofrisinguniversitycosts,manystudentsarefin
随机试题
Weather______,ourfamilycangotothegrasslandinInnerMongoliaandstaywi
[originaltext]Igrewupinasmalltown.Myfatherraisedchickensandran
Therestaurantnextdoorservesgoodfood,buttheoneacrossthestreetismuch
鸦片战争后,中国社会陷入了内忧外患的黑暗境地,中国人民经历了山河破碎,民不聊生的
协助食物消化吸收的胆汁由以下组织细胞分泌( )。A.胆总管 B.十二指肠
根据下列材料,按要求完成教学设计任务。 材料一: 《普通高中历史课程标准(实
梅毒感染时可引起哪种细胞增多()A.中性粒细胞B.淋巴细胞C.嗜酸性粒细胞D.
A. B. C. D.
区域全面经济伙伴关系协定(RCEP)2022年3月18日起对()生效。A.
赫尔巴特的传统教育强调的是()。A.以教师为中心 B.以学生为中心 C.以
最新回复
(
0
)