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 Asia. C、To Maryland. D、To Canada. D四个选项均是地名,可猜测题目与地点有关。短文说,白蜡虫向北扩散奎Ontario,Canada。故D是正确答案。A说的Michigan是美国首次发现
A、To Michigan. B、To Asia. C、To Maryland. D、To Canada. D四个选项均是地名,可猜测题目与地点有关。短文说,白蜡虫向北扩散奎Ontario,Canada。故D是正确答案。A说的Michigan是美国首次发现
admin
2019-04-22
52
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、To Michigan.
B、To Asia.
C、To Maryland.
D、To Canada.
答案
D
解析
四个选项均是地名,可猜测题目与地点有关。短文说,白蜡虫向北扩散奎Ontario,Canada。故D是正确答案。A说的Michigan是美国首次发现这种昆虫的地方,B中的Asia是该昆虫的来源地,C说的Maryland是美国东部遭受虫害的其中一个州,皆非题目所问。
转载请注明原文地址:https://kaotiyun.com/show/KnX7777K
0
大学英语六级
相关试题推荐
A、Becausetheywereconsideredinformalandcasual.B、Becausetheybecameasymbolofyouthrebellion.C、Becausetheyhadthezi
A、Theyhavethought.B、Theyreplaceourjobs.C、Theyperformboringtasks.D、Theycreateexplosions.B录音开头提到,机器人占领世界或许并非如此戏剧性,他们
A、Hemadeuphismindtoworkforthedisable.B、Hedecidedtoworkinanautocompany.C、Heunfortunatelyhadacaraccident.D
TextbooksintheU.S.aresoexpensivethatevenusedversionscangivestudentsasharppaininthewalletThe7theditionofF
A、Itistheonlycompanydevelopingself-drivingcars.B、ItcooperateswithInfinitiindevelopingself-drivingcars.C、Itneeds
GeorgeHerbertMeadsaidthathumansaretalkedintohumanity.Hemeantthatwegainpersonalidentityaswecommunicatewithot
A、31%.B、25%.C、20%.D、73%.C浏览四个选项,根据选项中出现的百分比推测,此题与数字或比例有关。题干问的是在被调查的人员中,工作不开心的人占多大比例。对话中男士提到在被调查人员当中,25%的上班族觉得工作是非常开心的,然而20%的
A、Itimprovesstudents’abilitytothink.B、Itisaccessibleonlytothetalented.C、Itstartsalifelonglearningprocess.D、It
A、Theirwork.B、Theirhomelives.C、Theirhealth.D、Theirmarriage.D演讲中提到,“75年来,我们跟踪调查了724位男性,年复一年,我们询问他们的工作、家庭生活、他们的健康状况,当然我们在
A、ComedyoriginatedinancientRome.B、TheatersoriginallyappearedinItaly.C、Stand-upcomedianswerepopularinFrance.D、Com
随机试题
境内企业的外方在境外的控股公司申请上市,从而达到境内企业上市的目的,被称为()
固定义齿固位体设计,不正确的是
面呈六边形的牙是
属于名城整体空间环境保护方法的是()。
根据《标准施工合同》,对于未达到必须招标规模或标准的项目,可自监理人在暂估价内直接确定价格的是()。
根据《个人所得税法》的规定,下列各项中,免征个人所得税的有()。
下列属于印花税纳税人的有()。
“夫君子之行,静以修身,俭以养德,非淡泊无以明志,非宁静无以致远”。下列关于道德的说法中,你认为正确的是()
胃分泌的内因子不足时,则()吸收不良,造成巨幼红细胞性贫血。
公司的某件物品丢失。领导查找几次未有结果。你从各方面获得的线索表明这件事情很有可能是某某同事干的。你会()。
最新回复
(
0
)