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
专升本
The "balance of nature" is not an empty phrase. Nature provides a population to occupy a suitable environment and cuts down surp
The "balance of nature" is not an empty phrase. Nature provides a population to occupy a suitable environment and cuts down surp
admin
2015-10-30
22
问题
The "balance of nature" is not an empty phrase.
Nature provides a population to occupy a suitable environment and cuts down surplus population to fit the available food supply.
One means of reducing surplus population is predators(食肉动物); others are parasites(寄生虫)and diseases. Also, population density produces nervous disorders and even drives animals to mass migrations, like the lemmings(旅鼠)of Norway who plunge into(跳入)the sea.
That predators populations increase to control other animals has long been known. Many years ago, the Hudson’ s Bay Company records revealed that the fox population went up and down about a year after the rabbit population had gone up and down.
Sometimes a situation occurs in which the predators population is reduced to a level below that which nature can readily replace. On Valcour Island in Lake Champlain(New York), a costly campaign resulted in the elimination of predatory animals only to have birds and small animals—including grouse(松鸡)and hares, popular game(猎物)—increase for four years afterward. Then lacking predator control, nature resorted to diseases to cut down these populations.
Jamaica had an example of nature’ s persistence in providing animals for existing habits. Sugar planters, about 75 years ago, imported mongooses to control rats. The mongooses killed off the rats and, with plentiful food, multiplied. Rats became scarce and the mongooses ate lambs, kids, puppies(小狗), and wildlife. Eventually, food became scarce and the mongoose’s population declined.
When predators control is not available, nature brings animal population into balance by resorting to______.
选项
A、hunters
B、diseases
C、storms and flood
D、forest fires
答案
B
解析
文章第三段的最后一句说到“Thenlacking predator control, nature resorted todiseases to cut down these populations.”而且在文中的第一段已指出有三种方式:其一食肉动物,其二寄生虫,其三是疾病。这里的nature即用的是第三种方式。故选B。
转载请注明原文地址:https://kaotiyun.com/show/YyYC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
MostEnglishpeoplehavethreenames:afirstname,amiddlenameandthefamilyname.Theirfamilynamecomeslast.Forexample
TheotherdayIheardanAmericansaytoaChinesestudentofEnglish"YouspeakverygoodEnglish."Butthestudentanswered,"
TheNorwegianGovernmentisdoingitsbesttokeeptheoilindustryundercontrol.Anewlawlimitsexplorationtoanareasouth
Forthispart,writeapassageabout100~120wordsentitledWhatStudentsNeedEnglishfor.
Manyoftheworld’spollutionproblemshavebeencausedbythecrowdingoflargegroupsofpeopleintothecities.Supplyforth
Forthispart,youaresupposedtowriteanoticeinEnglishin100-120wordsbasedonthefollowingsituation.Remembertowrit
ThehomecomputerindustryhasbeengrowingrapidlyintheUnitedStatesinthelasttenyears.Computersusedtobelarge,expe
ThehomecomputerindustryhasbeengrowingrapidlyintheUnitedStatesinthelasttenyears.Computersusedtobelarge,expe
ForanyEnglishmantherecanneverbeanydiscussionastowhoistheworld’sgreatestpoetandgreatestdramatist.Onlyonenam
Yearsagoourcitieswerefullofcars,busesandtrucks.Nowthestreetsarecompletelycongested(拥挤的)anditisverydifficul
随机试题
在人身保险经营中,有许多未来因素是通过预测得出的。通常保险人在对长期因素的预测上所采取的策略是()。
在计算机网络中,TCP/IP是一组()。
资源保护型旅游景区往往是以()为依托的,景区的目标具有多重性。
尊重信任学生是教师的()之一。
“同是天涯沦落人,相逢何必曾相识”这一名句的作者是自居易。()
如果要在中国艺术里寻找一种雅俗交融的代表,那么戏曲应该是_______的。在中国戏曲漫长的发生、发展过程中,始终存在着“雅”和“俗”的一种良性_______,它们共同_______了中国戏曲的文化品格。填入画横线部分最恰当的一项是:
下列案例中构成犯罪未遂的是()。
尽管从中央政府到地方政府都十分重视农民工问题,但问题办起来总显得慢半拍甚至慢几拍。农民工问题涉及数量大,执行起来有难度,这是人所共知的,但不少政策在一些地方三五年都仍停留在讨论阶段,还总是“需要研究”,这就让人想不明白。该语段下面可能要表达的主要意思是(
GregLouganis:Thesewerethetrialsforthe1988OlympicsinSeoul,Korea.Untilthisdive,Ihadbeenahead.Butnow,some
Issuesconcerninghumanlearningareamongthecriticaltopicsineducationalpsychology,childdevelopment,andcognitivescie
最新回复
(
0
)