首页
登录
职称英语
[originaltext] Today we continue our series on ecology and conservation with
[originaltext] Today we continue our series on ecology and conservation with
游客
2023-08-14
14
管理
问题
Today we continue our series on ecology and conservation with a look at a particularly endangered member of the black bear family.[16]One in ten black bears is actually born with a white coat, which is the result of a special gene that surfaces in a few. Local people have named it "the spirit bear". And according to the legends of these communities, its snowy fur brings with it a special power. Because of this, it has always been highly regarded by local people—so much that they do not speak of seeing it to anyone else. It is their way of protecting it when the strangers visit the area.
The white bear’s habitat is quite interesting. The bear’s strong relationship with the old-growth rainforest is a complex one. The white bear relies on the huge centuries-old trees in the forest in many ways. For example, the old-growth trees have extremely long roots that help prevent erosion of the soil along the banks of the many fish streams. Keeping these banks intact is important because these streams are home to salmon, which are the bear’s main food source. In return, the bear’s feeding habits nurture the forest. As the bears eat salmon, they discard the skin and bone in great amounts on the forest floor, which provide vital nutrients. These produce vegetation that sustains thousands of other types of life forms, from birds to insects and more.
Today, the spirit bear lives off the coast of the province of British Columbia on a few islands. There is great concern for their survival since it is estimated that less than two hundred of these white bears remain. The best way to protect them is to make every effort to preserve the delicate balance of their forest environment—in other words, their ecosystem.
The greatest threat to the bear’s existence is the loss of its habitat. Over many years, logging companies have stripped the land by cutting down a large number of trees. In addition, they have built roads which have fractured the areas where the bear usually feeds, and many resting sites have also been lost. The logging of the trees along the streams has damaged the places where the bears fish. To make matters worse, the number of salmon in those streams is declining because there is no legal limit on fishing at the moment.
16. What makes "the spirit bear" look special?
17. What do local people do to protect "the spirit bear" from strangers?
18. Why is keeping banks intact important for bears?
19. What is the biggest threat to the bear?
选项
A、Loss of the forests.
B、Loss of its habitat
C、Human’s limitless hunting.
D、Limited food resources.
答案
B
解析
录音提到,对于现存的熊类而言,最大的威胁是它们栖息地的减少,故B项“栖息地的减少”为答案。A项“森林的减少”是造成栖息地减少的原因之一。C项“人类的无节制的狩猎”没有在录音中提及。录音提到,人们修路伐木破坏了鲑鱼的生存场所,无节制的捕鱼致使熊类的主食鲑鱼数量减少,但这并不是对现存的熊类的最大威胁,排除D项“有限的食物资源”。
转载请注明原文地址:https://tihaiku.com/zcyy/2925473.html
相关试题推荐
[originaltext]Manyareasaroundtheworldsufferfromfrequentlossofelec
[originaltext]Manyareasaroundtheworldsufferfromfrequentlossofelec
[originaltext]W:Asinglecigarettesoldonastreetcornermaynotcostalot;
[originaltext]W:Asinglecigarettesoldonastreetcornermaynotcostalot;
[originaltext]IfyouareinterestedinstudyingatanAmericanuniversity,
[originaltext]IfyouareinterestedinstudyingatanAmericanuniversity,
[originaltext]Cleanairisimportanttogoodhealth.Iftheaircontainsim
[originaltext]Cleanairisimportanttogoodhealth.Iftheaircontainsim
[originaltext]W:[5]ProfessorSmith,Iwonderifyoucanfillmeinonyourlec
[originaltext]W:[5]ProfessorSmith,Iwonderifyoucanfillmeinonyourlec
随机试题
Somestudentsarenotadequatelypreparedforcollege.Shouldweturnthema
Thespokesmanadmittedthatthegovernment’sthoughtlesspolicyhadcausedacri
FindYourHeart’sDesireandRealizeYourPotential[A]Oneofthemostw
连续successively
Lookingbackonmychildhood,Iamconvincedthatnaturalistsarebornandn
在计算机网络中,主机及主机上运行的程序可以用()来标识。A.IP地址,端口号
地下洞室围岩监测宜在有代表性的地段布置围岩的监测,下述布置原则说法不准确的是(
地役权是一种独立的( ),是指当事人按照合同约定利用他人的不动产,以提高自己不
不属于巴洛克艺术风格的作品( )。A.《圣德列萨的沉迷》 B.《大卫》 C
根据税收征收管理法律制度的规定,下列关于纳税申报方式的表述中,不正确的是(
最新回复
(
0
)