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
2024-04-02
3
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://www.tihaiku.com/zcyy/3536952.html
相关试题推荐
[originaltext]Today,wearegoingtocontinueourdiscussionofsocialinse
[originaltext]Today,wearegoingtocontinueourdiscussionofsocialinse
[originaltext]Someofthemostpracticallessonscomingoutofresearchin
[originaltext]Someofthemostpracticallessonscomingoutofresearchin
[originaltext]WeonlyhaveafewminutesleftsoI’dliketogooveracoup
[originaltext]Humanbeingshavelivedonthisearthforatleasttwomillio
[originaltext]TexaswasthebiggeststatebeforeAlaskabecametheforty-ni
[originaltext]TexaswasthebiggeststatebeforeAlaskabecametheforty-ni
[originaltext]M:Hi,Sherrill.W:Hello,Fill,howareyou?M:I’mfine,where
[originaltext]M:Hi,Sherrill.W:Hello,Fill,howareyou?M:I’mfine,where
随机试题
DictationListentothepassage.Forquestions21-25,fillintheblankswith
Munich’sfirst"Oktoberfest"everwasheldin1810tocelebratearoyalwedd
从一瓶浓度为20%的消毒液中倒出2/5后,加满清水,再倒出2/5,又加满
某高速公路项目部施工技术员,根据施工现场情况,对施工用机械设备进行安排。因取土区
水提液在日光下显橘红色的中药是A.苏木B.降香C.沉香D.钩藤E.鸡血藤
患者女,65岁。遵医嘱每天服用补钙制剂阿仑膦酸钠1次。正确的服药时间是A.晨起
2016年6月份,我国社会消费品零售总额26857亿元,同比增长10.6%,环比
如图,正方形ABCD的边长为2,点O是对角线BD上的一点,点O从B点出发沿对角线
杨老师在教授生字词的过程中发现部分学生有丢笔少画的现象,于是把“小学生丢笔少画现
关于勘验、检查,下列哪些说法是正确的:A.侦查人员执行勘验、检查,必须持有公安机
最新回复
(
0
)