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
33
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
WhyWeNeedGoodTeachers[A]TherelativedeclineofAmericaneducationattheelementary-andhigh-schoollevelshaslongbeen
A、Becausetheywantedtobeclosertothegovernment.B、BecauseTokyowasthehistoricalcommercialcapital.C、Becausethepopul
Widespreadadoptionofplug-inelectricvehiclescoulddramaticallycutgreenhousegaspollutionandreduceU.S.dependenceonf
Nooneworddemonstratedtheshiftincorporations’attentioninthemid-1990sfromprocessestopeoplemorevividlythanthesi
A、SheneverusedtheservicesofferedbytheCareerServicesCenter.B、Sheloggedonthee-fairsoftheCareerServicesCenter.
WhyAreAirlinesWithholdingSeats?[A]AfewmonthsagoIbookedaflightfortwoandthenwenttoselectseatsontheairline’
A、Theman’sprofessionalbackground.B、Theman’smajorsuccessestillnow.C、Theman’sviewonthecompany.D、Theman’squestion
Policeofficersmayhopethattheirpresenceinschoolswillhelpthembuildstrongrelationshipswithstudents,improvingpolic
A、Byobservingtheordinaryonesthathavealreadyerupted.B、Bystudyingthelargerpartofavolcanohiddenunderground.C、By
随机试题
下列关于普通心肌细胞动作电位的描述,正确的是
煤焦油可致皮肤癌。研究发现,经煤焦油涂抹的皮肤如再接触佛波酯,肿瘤的发生率增加,潜伏期缩短。据此实验,佛波酯应属
依照有关法律、行政法规规定的职责和权限,()可以对有关单位的会计资料实施监督检查。
英译汉:“compression strength”,正确的翻译为( )。
证券的清算和交收统称为证券结算,包括证券结算和资金结算。()
关于债券的票面价值描述正确的有( )。
社会工作者在组员发言之后,站在同理心的角度,向发言者表达对其发言的高度重视,认真了解和把握发言者的用意与感受,并伴以积极的回应。这种沟通与互动技巧属于()。
人类特有的最高级的心理现象是()
FamilyMattersThismonth,Wyomingpassedabillthatwouldgivelegalteethtothemoralobligationtosupportone’sparent
WhichAttributesofaFoodProductareMostImportanttoConsumersA)TheAustralianstateofVictoriaisinvestinginapro
最新回复
(
0
)