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
51
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/2946337.html
相关试题推荐
[originaltext]SummermeansinternshipsforthousandsofAmericancollegest
[originaltext]SummermeansinternshipsforthousandsofAmericancollegest
[originaltext]SummermeansinternshipsforthousandsofAmericancollegest
[originaltext]SummermeansinternshipsforthousandsofAmericancollegest
[originaltext]Welcome,everybody,tothelovelyhouseandgardensofRosewo
[originaltext]HarvestFestivaltakesplaceintheautumn.Itisaveryanci
[originaltext]M:SoJanice,youwerelookingatidentifyingdifferenttalentsi
[originaltext]M:SoJanice,youwerelookingatidentifyingdifferenttalentsi
[originaltext]W:MayIhelpyou?M:Yes.Iwouldliketoapplyforoneofthese
[originaltext]W:WheredidMarygoyesterdaymorning?M:ShewenttotheCityo
随机试题
BiologicalPestControlBiologicalcontrolis,generally,
通过下列措施可以提高销售息税前利润率的有()。 Ⅰ.提高安全边际率 Ⅱ.提高
关于产权比率,下列说法正确的是( ). Ⅰ.从股东来看,在通货膨胀加剧时期,
提取含挥发性成分的中药不宜使用的方法是A.浸渍法B.渗滤法C.煎煮法D.回流提取
由于房地产业的性质,房地产业应该是国民经济发展的()产业。A.滞后性
下列关于教育政策的说法不正确的是( )。A.《国家中长期教育改革和发展规划纲
闭合性肾损伤最常用的治疗方法是A.肾修补术 B.引流 C.暂保守,密切观察
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性。( )
(2012年真题)在软土地层修建地铁车站,需要尽快修复上部路面交通时,车站基坑施
建筑物内普通市话电缆芯线接续,应采用的接续方法为()A.扭绞接续 B.旋转卡接
最新回复
(
0
)