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、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
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
admin
2021-07-14
19
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:https://kaotiyun.com/show/HgJ7777K
0
大学英语六级
相关试题推荐
Forthispart,youareallowed30minutestowriteashortessayentitledTheImpactofOnlineGamesonCollegeStudents.Youre
TakingaGapYearBeforeEnteringCollegeSupposeyouareaskedtogiveadviceonwhetherstudentsshouldtakeayearoffbef
A、Theinjuryofsomestudents.B、Aschoolbuscrashontheway.C、Thecollapseofaschoolbuilding.D、Afirethatbrokeouton
TheUnitedStateshasamajorproblemonitshands.Theonlywaytosolveitisthrougheducation.Negroes(黑人)shouldknowabout
A、Sheisworriedshecan’tattendthecourse.B、Sheisworriedshehastochangeprofessor.C、Sheisworriedshemightnotbeab
A、Atouraroundthecity.B、Acruisealongtheriver.C、Avisitaroundthecampus.D、Discussionandsomeseminars.B男士在说到对代表团的活动
Althoughtherearebodylanguagesthatcancrossculturalboundaries,cultureisstillasignificantfactorinallbodylanguage
A、Poverty.B、Diseases.C、Brokenmarriage.D、Failure.D录音开头,说话人开门见山地指出自己在大学生时代最害怕的不是贫穷而是失败,放D正确。
Forgetthewidelyunlovedredesign.Facebookhascommittedagreateroffense.AccordingtoanewstudybydoctoralcandidateAry
A、Doubtful.B、Guilty.C、Sad.D、Pessimistic.C①四个选项都是形容心理状态的词,因此本题很可能询问某人的感受。②短文开头提到,施瓦辛格初到美国参加了世界健美锦标赛,结果失败了,他伤心欲绝,大声痛哭。C中的sad是对
随机试题
文化传统除了延续性的特点外,还具有()
A.易复性疝B.难复性疝C.嵌顿性疝D.绞窄性疝E.滑动性疝站立时肿块变大,平卧后肿块变小为
下列不是课堂总结的原则的是()。
我国公安机关是兼有刑事执法职能的行政机关,其刑事执法职能主要表现在()。
建立创新型国家的意义在于()。
小王、小李两人都在银行有存款,原来小王存款总数比小李多,小王取出210元后,小李的存款是小王的,小王现有多少元存款?
根据所给材料,回答下列问题。在一项庆祝活动中,一名学生依次为1、2、3号旗座安插彩旗,每个旗座只插一杆彩旗,这名学生有三杆红旗、三杆绿旗和三杆黄旗。安插彩旗必须符合下列条件:(1)如果1号安插红旗,则2号安插黄旗。(2)如果2号安插绿旗,则1号安插绿
下列各项中,与组织液生成无关的因素是
Whohasn’twantedtomasternotjusttwolanguagesbut10?TakeGiuseppeMezzofanti,a19th-centurypriestwhowassaidtobe【C1
Wesimplycan’tcompetewithothercompanies______weimproveourenginedesignandreducethecostofproduction.
最新回复
(
0
)