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
2018-04-17
40
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(跳人) 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.
Implied but not stated; ______.
选项
A、Sugar planters imported mongooses to control rats
B、Man should never tamper(损害) with nature
C、To upset the balance of nature can be troublesome
D、Man has complete control over nature
答案
C
解析
文中一开始便提到了自然界的平衡,而文中结尾处举的例子也表明,破坏平衡会造成问题。故选C。
转载请注明原文地址:https://kaotiyun.com/show/3aiC777K
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
Nowadaysmostpeopledecidequite【61】whatkindofworktheywoulddo.WhenIwasatschool,wehadtochoose【62】whenwewerefif
Nowadaysmostpeopledecidequite【61】whatkindofworktheywoulddo.WhenIwasatschool,wehadtochoose【62】whenwewerefif
ContrarytoitsrathernegativereputationintheWest,pigsinChinesecultureareasignofkindnessandgenerosity.Pigscare
OneBritishschoolisfindingthatallowingchildrentolistentomusicoreventohavetheTVonwhilestudyingishelpingimpr
OneBritishschoolisfindingthatallowingchildrentolistentomusicoreventohavetheTVonwhilestudyingishelpingimpr
Iam______ofthesameoldbreakfasteverymorning,
Ialwayshaveadifficulttimechoosingoriginalbirthdaypresents.Myimaginationneverseemstogetbeyondties,handkerchiefs
Aresomepeoplebornclever,andothersbornstupid?Orisintelligencedevelopedbyourenvironmentandourexperiences?Strang
ItwasrequestedthatthePresident______thestudentsaperformanceattheNewYear’sparty.
Supposeyouhaveabrickandaspongewhichareexactlythesamesize.Thebrickandthespongewilloccupythesameamountofs
随机试题
治疗体虚感冒,其治法是
釉质生长线釉板
关于犯罪嫌疑人、被告人有权获得辩护原则的理解,正确的是?
采暖通风与空调工程施工平面图中,下列说法中不正确的是()。
背景A公司承包某超高层建筑机电工程施工项目,该工程位于市中心繁华区,工程范围包括通风与空调、给水排水及消防水、动力照明、环境与设备监控系统等,建设单位要求A公司严格实施绿色施工,严格进行安全和质量管理。A公司项目部针对工程情况,制定了绿
下列不属于合伙协议必备条款的是()。
下列选项中,其各项指标的指数同比上升的是()。
对于保险公司而言,下列由于信息不对称而带来的“逆向选择”的情形是()。
社会主义政治文明建设的根本途径是()
A、Oncampus.B、Inrestaurant.C、Inclassroom.D、Indormitory.B本题考查的是考生的理解归纳能力.男士说“请把菜单拿过来”,女士问“你想点些什么?”,从“menu,order”等关键词可以看出对
最新回复
(
0
)