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
2023-08-22
79
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 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.
19. How far do the insects spread northward?
20. Why is part of the bark cut away?
21. 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
短文说,钻孔虫向北扩散至Ontario,Canada。故D是正确答案。四个选项是地名,可猜测题目与地点有关。A和C是美国的州名,B和D是国家名,边听边做好笔记。解题的关键在于听清楚问题,就可以对号入座找出正确的答案了。
转载请注明原文地址:https://tihaiku.com/zcyy/2946336.html
相关试题推荐
TheUnitedStatesisoneofthefewcountriesintheworldthathasanoffic
TheUnitedStatesisoneofthefewcountriesintheworldthathasanoffic
TheUnitedStatesisoneofthefewcountriesintheworldthathasanoffic
TheUnitedStatesisoneofthefewcountriesintheworldthathasanoffic
Heavierpeoplearemorelikelytobekilledorseriouslyinjuredincaracci
Heavierpeoplearemorelikelytobekilledorseriouslyinjuredincaracci
[originaltext]AmericanvisitorstoEasternAsiaareoftensurprisedandpuz
[originaltext]InBritainthebiggestnumberofworkingforeignerscomesfro
[originaltext]InBritainthebiggestnumberofworkingforeignerscomesfro
[originaltext]Thefamilyischanging.Inthepast,grandparents,parents,a
随机试题
PoliceLesson:SocialNetworkToolsHaveTwoEdgesOfficerTrey
对隧道内防水层铺设基面的相关要求,正确的包括()。A.喷射混凝土基面应平整
双代号网络图的三要素是:A.时差、最早时间和最迟时间 B.总时差、局部时差和计
“职业”是一个( )。A.分类变量 B.顺序变量 C.定量变量 D.定性
针对兼病或兼证治疗作用的药物A.君药 B.臣药 C.佐药 D.使药 E.
用一块凸透镜对着阳光,在透镜后面放一张白色纸屏,由于凸透镜对光线有会聚作用J屏
麻子仁丸的功能是A.温肾益精,润肠通便B.滋阴养血,润肠通便C.润肠泻热,行气通
患儿面色蜡黄,舌部震颤,血红细胞2.5×10/L,血红蛋白80g/L,血象以大细
非上市公司在股份挂牌前应与证券登记结算机构签订证券登记服务协议,办理全部或部分股
医疗机构施行特殊检查时A.由经治医师所在科室集体讨论后实施 B.由医疗机构负责
最新回复
(
0
)