首页
登录
职称英语
[originaltext]A beetle invasion in the United States has killed at least twenty
[originaltext]A beetle invasion in the United States has killed at least twenty
游客
2023-08-10
83
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.
[16] The emerald ash borer has destroyed trees in the Midwest and as far East in the United States as Maryland. [17] 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. [18-1] 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. [18-2] 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. [19] 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.
1.What’s the speaker mainly talking about?
2.How far do the insects spread northward?
3.Why is part of the bark cut away?
4.What is the government laboratory trying to do?
选项
A、To Michigan.
B、To China.
C、To Maryland.
D、To Canada.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2914496.html
相关试题推荐
ThemilitaryaspectoftheUnitedStatesCivilWarhasalwaysattractedthe
ThemilitaryaspectoftheUnitedStatesCivilWarhasalwaysattractedthe
[originaltext][19]Iamhonoredtobewithyoutodayatyourcommencementf
[originaltext][16]LeonardBernsteinsaidthattoachievegreatthings,you
[originaltext][16]LeonardBernsteinsaidthattoachievegreatthings,you
[originaltext][16]LeonardBernsteinsaidthattoachievegreatthings,you
[originaltext]Theworld’ssmartestadolescentsinmathematicsandsciencea
[originaltext]Theworld’ssmartestadolescentsinmathematicsandsciencea
[originaltext]Theworld’ssmartestadolescentsinmathematicsandsciencea
[originaltext]Weallscreamforwaterwhenthirsty.[9]Butdoyouknowinv
随机试题
[originaltext]Goodmorning,ladiesandgentlemen,andthankyouMr.Chairma
There’snobetterfeelinginajobthanwhenyouknowthebosshasfullconf
淋病治愈的标准是治疗结束后2周内A.分泌物涂片阴性 B.无临床症状及体征,治疗
《劳动合同法》是为了完善劳动合同制度,明确劳动合同双方当事人的权利和义务,保护用
在计算机信息处理中,数据组织的层次依次是( )A.数据、记录、文档、数据库
下列有关证券市场发展历史的说法,正确的有() Ⅰ.美国证券市场是从买卖政府债
A.12 B.10 C.8 D.4
某运输公司利用40英尺的集装箱向某地发运两种可装配的商品,该型号集装箱的限重为2
生产经营单位应统一采购劳动防护用品,到货后组织相关人员进行验收,下列做法中,错误
开发建设项目水土流失防治指标包括( )。A、土地侵蚀模数 B、扰动土地整治率
最新回复
(
0
)