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
2023-08-12
59
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.[9]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, fanners 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.[12]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、They were original insects found in Detroit.
B、They went with goods from Asia in the 1990’s.
C、They flied from the Midwest to the Far East.
D、They followed the shipments from Ontario.
答案
B
解析
短文提到,专家认为这种绿色的白蜡虫是在上世纪90年代跟着从东亚装运的货物到达美国的,故选B。这种昆虫确实是在底特律首次发现的,但A中的original表明是当地原始的昆虫,故不对。C中的Midwest和Far East以及D中的shipments和Ontario均可从短文中听到,但它们只是利用原词干扰。
转载请注明原文地址:http://tihaiku.com/zcyy/2919433.html
相关试题推荐
[originaltext]W:Whenwasthelasttimeyouwentforawalkinyourlocalpark?
[originaltext]W:Whenwasthelasttimeyouwentforawalkinyourlocalpark?
[originaltext]W:Whenwasthelasttimeyouwentforawalkinyourlocalpark?
[originaltext][19]Imagineabigexplosionasyouclimbthrough3,000ft.I
[originaltext][19]Imagineabigexplosionasyouclimbthrough3,000ft.I
[originaltext]E-booksarebringingaboutaprofoundrevolutioninthewayb
[originaltext]E-booksarebringingaboutaprofoundrevolutioninthewayb
[originaltext]E-booksarebringingaboutaprofoundrevolutioninthewayb
[originaltext]W:Hello.Isthistheregistrationoffice?M:Yes.ThisisHerber
[originaltext]W:Hello.Isthistheregistrationoffice?M:Yes.ThisisHerber
随机试题
Jackarrivedattherailwaystationat4o’clockintheafternoon.Itwas4o’cl
Punctuality(准时)meansobservingregularorappointedtime.Amanwhogetsu
图示三种金属材料拉伸时的曲线,下列中的哪一组判断三曲线的特性是正确的?A.a
显微镜凝集试验常用于A.奋森疏螺旋体 B.雅司螺旋体 C.梅毒螺旋体 D.
从异体移植术后发生免疫排斥时间来分类,以下属于急性排斥反应的是A.移植术后2小时
区域似大地水准面精化时,下列数据中,不需要的是()。A:区域沉降测量数据B:区
行政法律关系具体包括行政主体与行政相对人的直接管理关系、宏观调控关系、服务关系、
关于《绿色建造技术导则》资源节约中,减少固体废弃物产生的规定与要求,表述正确的为
某火力发电企业安全管理人员每天进行一次现场巡回检查,其行走路线依次为:控制室-省
下列按水平投影面积1/2计算建筑面积的有()。A.屋顶上的水箱 B.有顶
最新回复
(
0
)