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
2024-04-04
50
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:http://tihaiku.com/zcyy/3540176.html
相关试题推荐
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorf
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorf
[originaltext]Whenwethinkofgames,thereareallkindsofthings.Maybeyou’
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttwenty
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttwenty
[originaltext][12]Intoday’spersonalitystakes,nothingismorehighlyvalued
[originaltext][12]Intoday’spersonalitystakes,nothingismorehighlyvalued
[originaltext][12]Intoday’spersonalitystakes,nothingismorehighlyvalued
[originaltext]Pianosarenormallyfoundinbuildingforobviousreasons.Howeve
随机试题
Allthereferencesshehasobtainedforherdoctoraldissertation______aboutt
Notuntilmostofthepeoplehadlefttheairport_____hissisterwasthere.A、h
某信息化建设项目的状态数据为:实际成本(AC)=44150元,计划值(PV)=4
某企业三种产品的单位成本和产量资料如下表: 若根据上表资料编制三种
关于血糖测定正确的是A.血糖测定受饮食影响,但不受取血部位影响B.全血葡萄糖浓度
某企业2018年2月1日从银行借入期限为3年的长期借款2100万元,编制2020
招标采购管理方案涉及的控制范围的层次不包括()。A、针对招标采购活动进行规划B
诺言:履行 A.思想:交流 B.选择:武断 C.电影:制片 D.名
随着时代的进步,新型的、民主的家庭气氛和父母子女关系还在形成,但随着孩子的自我意
小脑幕裂孔疝与枕骨大孔疝根本区别是A、剧烈头痛 B、频繁呕吐 C、意识障碍发
最新回复
(
0
)