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
2024-04-19
46
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 clear up the eggs of insects.
B、To help trees deliver water.
C、To look for the signs of insects.
D、To prepare for cutting down trees.
答案
C
解析
短文说,钻孔虫是在树上产卵,孵出的幼虫钻到内层树皮吸取营养,故把部分树皮削去会使树更容易成为攻击的目标,当钻孔虫来袭时就能有所发觉。故C是正确答案。从选项可以初步猜测题目与树木和昆虫有关。解题时需听清楚问题问的是什么。
转载请注明原文地址:https://tihaiku.com/zcyy/3562601.html
相关试题推荐
[originaltext]Hello,I’mCallumRobertsonandyou’relisteningtothemusic
[originaltext]Hello,I’mCallumRobertsonandyou’relisteningtothemusic
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
[originaltext]Pianosarenormallyfoundinbuildingforobviousreasons.Ho
[originaltext]W:Hi,Dr.Hyde.M:So,whatseemstobetheproblemtoday?W:Well,
[originaltext]W:Dad,youalwaysloveme,don’tyou?M:Sure.But,wait,wait.Wh
[originaltext]W:Themountainseemstohavegrown,IfeelsodizzywhenIclimb
[originaltext]W:Themountainseemstohavegrown,IfeelsodizzywhenIclimb
[originaltext]W:Themountainseemstohavegrown,IfeelsodizzywhenIclimb
随机试题
Johnisverydiligent,buthispayisn’tsufficientenoughforhiswork.A、goodB
Inrecentyearsfirmshavestuffedalotmoremoneyintotheirfinal-salary
某牙膏企业在市场细分的基础上,将其目标市场面向儿童,实行专业化经营。该企业采取的
眶上裂在眶上壁和眶外壁之间,其后通向A.颅前窝 B.颅中窝 C.颅后窝 D
具有补肾助阳、润肠通便功效的药物是()A.山药 B.白术 C.当归
萜类化合物由什么衍生而成A.甲戊二羟酸B.异戊二烯C.桂皮酸D.苯丙氨酸E.酪氨
A.尿酸B.肌苷C.肌苷酸D.肌酸E.肌酐为核酸的一种,其化学结构名称为次黄嘌呤
《变电验收管理规定》:以下不属于地市公司运检部履行的职责的是()。(A)参加50
问题解决的试误说的奠基人是()。 A.桑代克B.苛勒C.纽厄尔和西蒙D
共用题干 一般资料:求助者,男性,38岁,私营企业总经理。案例介绍:求助者有一
最新回复
(
0
)