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
2016-04-03
60
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. [21]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/NsG7777K
0
大学英语六级
相关试题推荐
Onequestionthatworriesmanyvisitorstodefensivecarry.com,awebsitedevotedtothedelightsanddifficultiesoflifewitha
Iamoneofthemanycitypeoplewhoarealwayssayingthatgiventhechoiceweshouldprefertoliveinthecountryawayfromt
Livingnearairportsmightnotonlyleadtoresidentssufferingsleeplessnights—theycouldalsohaveterribleweather,scientis
Breedinginmostorganismsoccursduringapartoftheyearonly,andsoareliablecueisneededtotriggerbreedingbehaviour.
AccompanyingIndia’sindustrialtransformationhasbeenanotherrevolutionofprofoundsignificance.Aproperty-owningmiddlecl
A、Inaparkinglot.B、Atagrocery.C、Atafastfoodrestaurant.D、Inacarshowroom.C对话中女店员拿给男士一块蛋糕以及一小杯咖啡,告知总共是35元钱,并询问男士是要在店
A、Skiptheprofessor’sclass.B、Talkwiththeviolinist.C、Performinaconcert.D、Gotoenjoytheconcert.D对话中男士提到教授刚才谈论的著名小提琴
NewYear’sresolutionsoftenhavetodowitheatingmorehealthily,goingtothegymmore,losingweight—alladmirablegoalsa
A、Itwasmorerespected.B、Itwasusedbymorepeople.C、Itwasvandalizedbytourists.D、ItquicklydeterioratedagainafterLi
A、GotosleepB、Watchtheprogramlater.C、Changethechannel.D、Setthealarmclock.A“skip”的意思是“跳过,不参加某项活动”。“IfIwereyou...”
随机试题
错误的决策和糟糕的决策之间是否存在某种差异?为什么优秀的管理者也会作出错误的决策?他们为什么还会作出糟糕的决策?管理者如何提高自己的决策能力?
目前虽然急性白血病的病因尚不清楚,但受一些因素的影响,对急性白血病的发生影响最小的因素是
A市中级法院以故意伤害罪判处被告人死刑缓期二年执行,被告人没有上诉,检察机关没有抗诉。该案经B省高级法院核准。判决生效后,被害人某甲不服,提起申诉。如果判决确有错误,下列哪一司法机关有权提起审判监督程序?
建设工程发生质量事故,有关单位应当在24h内向当地建设行政主管部门和其他有关部门报告。()
双倍余额递减法下,在折旧年限到期前两年内,为避免固定资产账面折余价值降低到它的预计残值收入以下,将固定资产账面净值扣除预计净残值后的余额平均摊销。()
中国营养学会提出的蛋白质推荐摄入量成年男子、轻体力活动者为()g/d。
【2014年浙江温州】适龄儿童、少年的父母或者其他法定监护人无正当理由未依法送适龄儿童、少年入学接受义务教育的,应由当地乡人民政府或县级教育行政部门________,责令限期改正。
据《光明日报》(光明网2016年4月19日)教育周刊一则报道,2015年中国从事在线教育的企业数约2400~2500家,拥有数十万门在线教育课程,用户达到了近亿人次。人们在感到互联网的巨大力量的同时,每一个教育当事人都意识到,如何与互联网相处正成为教育不得
下列关于我国立法的表述,正确的是()(2012年非法学综合课单选第9题)
关于如何树立正确的人生态度,塞缪尔曾说过:“世界如一面镜子:皱眉视之,它也皱眉看你;笑着对他,他也笑着对你。”新时代的大学生应该秉持的人生态度应当是
最新回复
(
0
)