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
2024-04-01
35
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/3536522.html
相关试题推荐
[originaltext]Ateverystageofourliveswemakedecisionsthatwillprofo
[originaltext]Whenachildisaskedbyparentswhattheygotuptoatschoo
[originaltext]Whenachildisaskedbyparentswhattheygotuptoatschoo
[originaltext]Moderator:Hello,everyone!It’sagreatpleasureformetos
[originaltext]Moderator:Hello,everyone!It’sagreatpleasureformetos
[originaltext]Moderator:Hello,everyone!It’sagreatpleasureformetos
[originaltext]Afewmonthsago,Iwasaskedtogiveatalkaboutfun.Thec
[originaltext]Afewmonthsago,Iwasaskedtogiveatalkaboutfun.Thec
[originaltext]Moderator:Helloladiesandgentleman,itgivesmegreatplea
[originaltext]Moderator:Helloladiesandgentleman,itgivesmegreatplea
随机试题
Whilelongwalksaregreat,campingforseveraldaysisabetter,more【C1】__
【S1】[br]【S10】D该空格前为形容词common,空格后为介词of,因此填入空格处的应为名词。该句意为“我很愿意相信,这对于我们每个人来说都是个整体
中枢下丘脑性尿崩症需要加压素治疗,从药物作用时间、给药途径和副作用等方面考虑,首
某股票看涨期权(A)执行价格和权利金分别为60港元和4.53港元。该股票看跌期权
根据《测绘技术设计规定》,下列内容中,属于测绘技术设计应遵循的基本原则的是A.
工业产权:是指法律规定对应用于生产和流通中创造发明和显著标记等智力成果在一定期限
当交易所涨跌停板制度、交割制度发生变化时,套利行为同样受到影响。()
(2017年真题)根据《行政许可法》规定,下列文件中,可以设定行政许可的
下列各项中,会引起资产与权益同时增加的有()。A.从银行提取现金备用 B
自动焊接机(ε=100%)单相380V,46kW,cosψ=0.60,换算其等效
最新回复
(
0
)