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
2024-05-10
11
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, 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. It examines and X-rays the seeds to make sure that 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.
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
短文说,实验室对种子进行检查和照X-ray,确保没有钻孔虫的受精卵,只有最好的被保存起来。故答案是B。
转载请注明原文地址:https://tihaiku.com/zcyy/3591624.html
相关试题推荐
[originaltext]Almost20,000whaleshavebeenslaughteredsinceabanoncom
[originaltext]W:Hi,Iunderstandthatthereareaerobicclassesforstudentsa
[originaltext]W:Hi,Iunderstandthatthereareaerobicclassesforstudentsa
[originaltext]W:Hi,Iunderstandthatthereareaerobicclassesforstudentsa
[originaltext]M:Hello?W:Hello,I’mcallingabouttheapartmentthatwasadve
[originaltext]M:Hello?W:Hello,I’mcallingabouttheapartmentthatwasadve
[originaltext]M:Ithinkyou’dbetterfindanotherpersontobeyourbadminton
[originaltext]M:Ithinkyou’dbetterfindanotherpersontobeyourbadminton
[originaltext]M:Ithinkyou’dbetterfindanotherpersontobeyourbadminton
[originaltext]M:Ithinkyou’dbetterfindanotherpersontobeyourbadminton
随机试题
Pursuingacareerisanessentialpartofadolescentdevelopment."Theadole
TherearemanydialectsofChinesewithradicallydifferentpronunciationsofth
为保证电力系统运行的稳定性,维持电力系统频率、电压的正常水平,系统应有足够的静态
患者,男性,51岁,昏迷。因过度换气,肌肉抽搐,面颊潮红。血气分析示:PaCO3
关于外科预防用药的叙述正确的是A、清洁手术的手术野无污染,但必须按常规预防应用抗
在讲“平面直角坐标系”时,王老师在讲授该知识前提出了这样一个问题:在数轴上一个点
关于社会工作价值观的说法,正确的有()。A:社会工作者应当使用统一规范的服务方法
常用络石藤而不用海风藤治疗的病证有A.风寒湿痹 B.喉痹痈肿 C.跌打损伤
党的群众路线教育实践活动要以( )的勇气和态度查找问题、剖析原因。A.高度负责
与其他资源相比,人力资源最为重要的特性包括()A.社会性 B.能动性 C.
最新回复
(
0
)