首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Northern marshes are being turned into empty, desecrated mud flat wasteland. The culprit? Snow geese. These marshes are the b
Northern marshes are being turned into empty, desecrated mud flat wasteland. The culprit? Snow geese. These marshes are the b
admin
2010-06-18
102
问题
Northern marshes are being turned into empty, desecrated mud flat wasteland. The culprit? Snow geese.
These marshes are the breeding ground for snow geese. Once destroyed, some fear the species will take over the habitat of the Canada goose — a popular game bird in Minnesota. If this happens, Minnesota hunting and land conditions could be greatly affected.
The snow goose population has been on the rise in the last 25 years, but numbers are hitting an all-time high. This year there is an estimated 4.5 or 6 million birds, triple what the population was 25 years ago.
Although effects of the snow goose invasion aren’t apparent in Minneapolis, northern Minnesota and Canada can clearly see the signs. The population growth is due to the birds’ wintering habits. They fly south to Louisiana, Texas and Mississippi to nest. The conditions and food availability there have made it possible for more birds to survive the winter and make the trip back north. The period over which they’ve increased in number correlates to a change in agriculture practices in the region.
After World War Ⅱ, there was an increase in man-made fertilizers, yielding an increase of corn, rice, wheat and other crops. There have also been other changes in agricultural practices causing an increase of production in cereal crops.
The geese find the agricultural areas better than the natural areas. The geese have escaped from any natural limits. They are not doing this on their own; it is in response to human practices.
Usually, about 70 to 75 percent of the birds make it back to Canada in late winter and early spring. But the surviving number of snow geese has steadily climbed each year to reach 95 percent in the last couple of years. Because so many survive, they strip the capacity of the breeding ground.
The snow geese are destroying salt marshes where they nest in the summer, about 30 percent of the salt marshes are completely destroyed, leaving them as inhabitable mud flats. Another 35 percent of salt marshes are significantly damaged.
There are three possible solutions: Let the problem take care of itself and wait for the population to crash, deal directly with the population by changing hunting limits and regulations or address the cause of the problem in the south.
The author seems to imply that ______.
选项
A、humans are responsible for the problem
B、hunting limits and regulations should be lifted
C、the birds have a strong capability to survive
D、the Canada geese are a better species than the snow geese
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/tLlO777K
0
专业英语八级
相关试题推荐
Inthe【B1】______annualBiblereadingmarathonthevolunteersreadreverentlyfrom【B2】______to_______________【B3】______.Atth
A、Itsjoblessrateis12%atpresent.B、1.38millionpeopleareofficiallyjobless.C、Thenumberofpeopleoutofworkis1.9
Inourlooks-obsessedsociety,manypeoplethinkthatbeingoverweightisanappearanceissue.Butbeingoverweightisactually
Oursisanagrarianeconomy.Wemustbecomeself-sufficientinfoodtofeedarapidlygrowingpopulationatanannualgrowthrat
Lastmonththefirstbaby-boomersturned60.Thebulkygenerationbornbetween1946and1964isheadingtowardsretirement.The
Thereisaperceptionabroadinthelandthat,becausesomesegmentsofthepublicaredissatisfiedwiththequalityofsomepar
Inthelate1960smanypeopleinNorthAmericaturnedtheirattentiontoenvironmentalproblems,andnewsteel-and-glassskyscra
A、Thelaboratorywasclosed.B、Thegeneratorwasturnedoff.C、Thepowergeneratormightexplode.D、Electricitywasgoingtorun
ThirtyyearsagoIturnedonourfamily’sblack-and-whiteconsoleTVtowatchanorchestraconductornearlyashyperactiveasI
随机试题
活动期结节病一般不会出现的实验室检查改变是
A.鱼际、外关B.血海、太冲C.中冲、涌泉D.关元、神阙、百会除主穴外虚脱伴有肢冷脉微者加
关于产褥感染的防治,下述哪项不妥
根据地表水水域功能和保护目标,地表水三类水适用于()。
采用滑模摊铺机施工法铺筑连续配筋混凝土路面时,布料最适合采用()。
采用顶椎法进行桥梁承载结构施工时宜在()上使用。
根据《水工混凝土施工规范》(DL/T5144--2001),浇筑仓面混凝土料出现下列()情况时,应予挖除。
胰岛素(非制剂)()
在现实世界中,每个人都有自己的出生地,实体“人”与实体“出生地”之间的联系是
Thegovernmentmusttakesomemeasures______thecity’spollution.
最新回复
(
0
)