首页
登录
职称英语
[originaltext] A beetle invasion in the United States has killed at least tw
[originaltext] A beetle invasion in the United States has killed at least tw
游客
2024-03-10
60
管理
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://tihaiku.com/zcyy/3522033.html
相关试题推荐
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorryr
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorryr
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]Twenty-fiveyearsago,RayAnderson,asingleparentwithao
[originaltext]Twenty-fiveyearsago,RayAnderson,asingleparentwithao
[originaltext]Twenty-fiveyearsago,RayAnderson,asingleparentwithao
随机试题
Shehesitatedfora______ofasecondbeforeacceptinghischallengetoagameof
Manytheoriesconcerningthecausesofjuveniledelinquency(crimescommitted
[originaltext]J:Divergenceisbynomeanstheonlypossibletendency.Somesch
Iwillhavebeguntodothework__________5o’clockthisafternoon.A、byB、atC、
扁桃体周脓肿穿刺抽脓时,刺入过深最易导致的并发症是:()A.局部组织损伤
下列化合物的IR光谱中出现3个羰基吸收峰的是A.大黄素B.大黄酸C.大黄素甲醚D
为什么一些灵长类动物的大脑尺寸比其它动物要大?原因通常被认为是社会行为,即灵长类
在产品的( ),产品刚进入市场,知名度低,不被人们所熟悉。A.介绍期 B.成
0.1-0.11+0.3-0.13+0.5-0.15+…..+0.9-0.19=
我国急性胰腺炎的病因最常见为A.药物诱发(类固醇激素等) B.腮腺炎合并 C
最新回复
(
0
)