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
49
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、Collect ash tree seeds for experiment.
B、Preserve the healthy ash tree seeds.
C、Set up a new seed bank for research.
D、Develop a new breed of ash tree.
答案
B
解析
选项均以动词原形开头,可以初步猜测题目与行动、建议或措施有关。短文说,实验室对种子进行检查和照X光射线,确保没有白蜡虫的受精卵,只有最好的才被保存起来。故答案是B。
转载请注明原文地址:https://tihaiku.com/zcyy/3522039.html
相关试题推荐
[originaltext]M:Hi,Mandy.How’severythinggoing?W:Nottoogood,Isuppose.
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorryr
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorryr
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorryr
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorryr
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]Twenty-fiveyearsago,RayAnderson,asingleparentwithao
[originaltext]Twenty-fiveyearsago,RayAnderson,asingleparentwithao
随机试题
LadyGaga’snewalbum______tonumberoneintheUKOfficialChart.A、hoistedB、
Whatmakesagoodmanager?Thereisn’tmagicformulaforgoodmanagement,of
Whenyouvacatetheroom,youshould______thedoorkeytome.A、handinB、hando
InBritain,peoplehavedifferentattitu
以下哪些是水库淹没影响处理范围?( )A.工程引水导致河段减水,流成生产生活引
甲公司主要生产A产品,市场占有率很高,不存在滞销问题,目前的销售价格为100元/
下列关于最高限价的表述错误的是()。A.采用最高限价的目标是保护消费者利益或降低
十二正经循行中阴经与阳经的交接部位是A.手指端 B.胸腹中 C.头面部 D
某公司从客户名录中随机抽取600个客户进行满意度和忠诚度调查,为了验证客户总体中
注册会计师在进行审计时遇到了以下的情况,其中,注册会计师不会增加强调事项段的有(
最新回复
(
0
)