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
2023-08-13
90
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、Shipments of goods from China.
B、Detection trees.
C、The seeds from ash trees.
D、The invasion of the emerald ash borer.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2923915.html
相关试题推荐
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStat
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStat
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStat
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStat
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStat
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorf
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorf
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorf
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorf
[originaltext]TodayI’dliketotalkaboutthesculptorHenryMoore,inpa
随机试题
ReadthetextbelowandanswerQuestions8-14.[img]2015m5x/ct_eirm_eirread_0246
Kate:Doyoumindopeningthedoorforme?Rita:______.A、Yes,I’lldoitB、It’s
Itisnecessarythathe(take)______agoodrestafterworkingforalongtime.
【B1】[br]【B19】A、conveyB、relayC、spreadD、codeA动词辨义题[考频:50]。这句的意思是“通过面部表情,鸟类可以
下列关于责任预算的说法中,不正确的是()。A.责任预算是对业务预算和财务预算的
国家电网公司变电检测通用管理规定中规定停电试验异常处理流程中首先要求排除(___
下列不属于新的课程结构的特点的是() A.均衡性B.综合性C.单一性D
A.切片 B.蒸 C.熏硫 D.发汗 E.置沸水中略煮或蒸杜仲加工需
假定某一股票的现价为32美元,如果某投资者认为这以后的3个月中股票价格不可能发生
(2000年真题)缺铁性贫血的实验室检查结果应是A.血清铁降低、总铁结合力升高、
最新回复
(
0
)