首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、To Michigan. B、To China. C、To Maryland. D、To Canada. D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,
A、To Michigan. B、To China. C、To Maryland. D、To Canada. D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,
admin
2015-06-07
62
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.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.
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://kaotiyun.com/show/z9Q7777K
0
大学英语六级
相关试题推荐
WeMustTrainPeopletoBreaktheRules[A]Layouttheentrails,readomensandauguries,studytheheavens,shakeyourhoarylo
A、Tofindoutwhatheisinterestedin.B、Tohelphimchooseanout-of-classactivity.C、Toencouragehimtotryoutforacolle
A、Theyareequallycompetentforthejob.B、Theybothgraduatedfromartschools.C、Theymajoredindifferent,areasofart.D、T
A、Davidneedstobalancehistimewithasociallife.B、Davidisfallingbehindhisfriendsinschool.C、Davidisworkinghardu
A、Thewomanisanurse.B、Thewomanisadoctor.C、Themanwillattendtheweightreductionprogram.D、Themanisinterestedin
A、Law.B、Music.C、Geology.D、Biology.B男士开头说女士申请的是地理学专业,因为由音乐专业转向地理不同寻常,所以男士建议女士要在她专业的特殊性方面予以说明。故可知女士大学本科时期学的是音乐专业,选B。
Tenyearsago,JoeAllenbeganstudyingadiversegroupofseventhgradersneartheUniversityofVirginia,wherehe’saprofess
A、Theamountofmoney.B、Familysize.C、Theniceneighbor.D、One’ssocialposition.D
Forthispart,youareallowed30minutestowriteanessaycommentingontheremark"Experienceisthemotherofwisdom."Youc
A、Hehashadthirteendecayedteeth.B、Hedoesn’thaveasingledecayedtooth.C、Hehasfewerdecayedteeththanotherpeopleof
随机试题
下列不属于非随机抽样的是()
主持评定工作和对焊接及试验结果进行综合评定的人员应是()。化工厂里的某些设备,如已组装好的换热器,可采用()的防腐蚀涂层方法施工。
某桥梁工地的简支板梁架设,由专业架梁分包队伍架设。该分包队伍用两台50t履带吊,以双机抬的吊装方式架设板梁。在架设某跨板梁时,突然一台履带吊倾斜,板梁砸向另一台履带吊驾驶室,将一名吊车驾驶员当场砸死,另有一人受重伤。事故发生后,项目经理立即组织人员抢救伤员
教育目的一经确立,就会成为人们行动的指南。这说明教育目的具有()。
立榜样、树标兵和杀一儆百、杀鸡儆猴利用的原理是观察学习中的()
TheTheoryofContinentalDrifthashadalongandturbulenthistorysinceitwasfirstproposedbyAlfredWegenerin1910.(46)
WhatareHenryCountyresidentsaskedtodo?
PASSAGETHREEWhatisthenameofanothercapsule?
A、Heagreeswiththewoman.B、Heisagoodlecturerhimself.C、HeisfondofProfessorSmith.D、Hepartlyagreeswiththewoman.
Individualsandbusinesseshavelegalprotectionforintellectualpropertytheycreateandown.Intellectualproperty【C1】______f
最新回复
(
0
)