首页
登录
职称英语
[originaltext]A beetle invasion in the United States has killed at least twenty
[originaltext]A beetle invasion in the United States has killed at least twenty
游客
2023-08-10
28
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.
[16] The emerald ash borer has destroyed trees in the Midwest and as far East in the United States as Maryland. [17] 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. [18-1] 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. [18-2] 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. [19] 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.
1.What’s the speaker mainly talking about?
2.How far do the insects spread northward?
3.Why is part of the bark cut away?
4.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
转载请注明原文地址:https://tihaiku.com/zcyy/2914772.html
相关试题推荐
[originaltext]M:Ididn’tseeyouincreativewritingclasstoday.Whathappene
[originaltext]M:HiJane,pleasecomeinandtakeaseat.W:Well,youwouldli
TheUnitedStateshasamajorproblemonitshands.Theonlywaytosolveit
TheUnitedStateshasamajorproblemonitshands.Theonlywaytosolveit
TheUnitedStateshasamajorproblemonitshands.Theonlywaytosolveit
TheUnitedStateshasamajorproblemonitshands.Theonlywaytosolveit
[originaltext]Whenwethinkofgames,thereareallkindsofthings.Maybeyou’
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttwenty
随机试题
Hisplaniscarefullypreparedandfullofdetails,soitisavery______one.A、
First,healthisthekeytohappiness.Onlyastrongmancanenjoythepleasure
[originaltext]TheWorldHealthOrganization(WHO)saysmoreeffortisneede
Text3Economistsacrossthepoliticals
内存储器中,每一个存储单元被赋予唯一的一个序号,该序号称为()。A.容量 B.
在日常生活中,会骑自行车的人往往比较容易掌握摩托车的骑法。这种现象被称为( )
若按照2018年同比增长率,到2019年底中国人工智能市场规模约为:A.3
“如果你关掉了所有错误的大门.真理也将被拒之门外。”与以上判断的含义最为接近的是
流程图是将一个()的步骤用图的形式表示出来的一种图示技术。 A.质量策划B
火灾探测器常见故障
最新回复
(
0
)