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
Deer Populations of the Puget Sound A) Two species of deer have been prevalent in the Puget Sound area of Washington State in th
Deer Populations of the Puget Sound A) Two species of deer have been prevalent in the Puget Sound area of Washington State in th
admin
2017-03-01
45
问题
Deer Populations of the Puget Sound
A) Two species of deer have been prevalent in the Puget Sound area of Washington State in the Pacific Northwest of the United States. The black-tailed deer, lowland, west-side cousin of the mule deer of eastern Washington, is now the most common. The other species, the Columbian white-tailed deer, in earlier times was common in the open prairie country, it is now restricted to the low, marshy islands and flood plains along the lower Columbia River.
B) Nearly any kind of plant of the forest understory can be part of a deer’s diet. Where the forest inhibits the growth of grass and other meadow plants, the black-tailed deer browses on huckleberry, salal, dogwood , and almost any other shrub or herb. But this is fair-weather feeding. What keeps the black-tailed deer alive in the harsher seasons of plant decay and dormancy? One compensation for not hibernating is the built-in urge to migrate. Deer may move from high-elevation browse areas in summer down to the lowland areas in late fall. Even with snow on the ground, the high bushy understory is exposed; also snow and wind bring down leafy branches of cedar, hemlock, red alder, and other arboreal fodder.
C) The numbers of deer have fluctuated markedly since the entry of Europeans into Puget Sound country. The early explorers and settlers told of abundant deer in the early 1800s and yet almost in the same breath bemoaned the lack of this succulent game animal. Famous explorers of the north American frontier , Lewis and Clark had experienced great difficulty finding game west of the Rockies and not until the second of December did they kill their first elk. To keep 40 people alive that winter, they consumed approximately 150 elk and 20 deer. And when game moved out of the lowlands in early spring, the expedition decided to return east rather than face possible starvation. Later on in the early years of the nineteenth century, when Fort Vancouver became the headquarters of the Hudson’s Bay Company, deer populations continued to fluctuate. David Douglas, Scottish botanical explorer of the 1830s found a disturbing change in the animal life around the fort during the period between his first visit in 1825 and his final contact with the fort in 1832. A recent Douglas biographer states; "The deer which once picturesquely dotted the meadows around the fort were gone (in 1832), hunted to extermination in order to protect the crops."
D) Reduction in numbers of game should have boded ill for their survival in later times. A worsening of the plight of deer was to be expected as settlers encroached on the land, logging, burning, and clearing, eventually replacing a wilderness landscape with roads, cities, towns, and factories. No doubt the numbers of deer declined still further. Recall the fate of the Columbian white-tailed deer, now in a protected status.
E) But for the black-tailed deer, human pressure has had just the opposite effect. Wild life zoologist Hulmut Buechner (1953), in reviewing the nature of biotic changes in Washington through recorded time, Says that "since the early 1940s, the state has had more deer than at any other time in its history, the winter population fluctuating around approximately 320,000 deer (mule and black-tailed deer), which will yield about 65,000 of either sex and any age annually for an indefinite period. "
F) The causes of this population rebound are consequences of other human actions. First, the major predators of deer—wolves, cougar, and lynx—have been greatly reduced in numbers. Second, conservation has been insured by limiting times for and types of hunting. But the most profound reason for the restoration of high population numbers has been the gate of the forests. Great tracts of lowland country deforested by logging, fire, or both have become ideal feeding grounds of deer.
G) In addition to finding an increase of suitable browse, like huckleberry and vine maple, Arthur Einarsen, longtime game biologist in the Pacific Northwest, found quality of browse in the open areas to be substantially more nutritive. The protein content of shade-grown vegetation, for example, was much lower than that for plants grown in clearings.
H) Deer are the ruminant mammals forming the family Cervidae. Species in the family include white-tailed deer, mule deer such as black-tailed deer, elk, moose, red deer, reindeer (caribou), fallow deer, roe deer and chital.
I) Male deer of all species (except the Chinese water deer) and also female reindeer grow and shed new antlers each year. In this they differ from permanently horned animals such as antelope; these are in the same order as deer and may bear a superficial resemblance. The musk deer of Asia and water chevrotain (or mouse deer) of tropical African and Asian forests are not usually regarded as true deer and form their own families, Moschidae and Tragulidae, respectively.
J) Deer are widely distributed, with indigenous representatives in all continents except Antarctica and Australia, though Africa has only one native species, the red deer, confined to the Atlas Mountains in the northwest of the continent. However, fallow deer have been introduced to South Africa.
K) Deer live in a variety of biomes ranging from tundra to the tropical rainforest. While often associated with forests, many deer are ecotone species that live in transitional areas between forests and thickets (for cover) and prairie and savanna (open space).
L) The majority of large deer species inhabit temperate mixed forest, mountain mixed coniferous forest, tropical seasonal/dry forest, and savanna habitats around the world. Clearing open areas within forests to some extent may actually benefit deer populations by exposing the understory and allowing the types of grasses, weeds, and herbs to grow that deer like to eat.
M) Additionally, access to adjacent croplands may also benefit deer. However, adequate forest or plants must still be provided for populations to grow and thrive.
N) Small species of brocket deer and pudus of Central and South America, and muntjacs of Asia generally occupy dense forests and are less often seen in open spaces, with the possible exception of the Indian Muntjac.
O) There are also several species of deer that are highly specialized, and live almost exclusively in mountains, grasslands, swamps, and "wet" savannas, or riparian corridors surrounded by deserts. Some deer have a circumpolar distribution in both North America and Eurasia.
The explorers killed approximately 150 elk and 20 deer to keep 40 people alive in that winter.
选项
答案
C
解析
指代题。根据数字150,20以及40定位到C)段第四句,原句是:To keep 40 people alive that winter,they consumed approximately 150 elk and 20 deer.由上一句可知原句中的“they”指代的是“explorers”。
转载请注明原文地址:https://kaotiyun.com/show/vFU7777K
0
大学英语六级
相关试题推荐
A、Becausemanypeoplearen’tsociable.B、Becausemostpeopleareshybynature.C、Becausenobodywilllaughatshypeople.D、Bec
Newtechnologylinkstheworldasneverbefore.Ourplanethas【B1】______.It’snowa"globalvillage"wherecountriesareonlys
Ahappymarriageapparentlyisgoodmedicine,buthostilespousesmay【B1】______oneanother’shealth.Couplesinconflict-ridden
I’minterestedinthecriminal【B1】______systemofourcountry.Itseemstomethatsomethinghastobedone,ifwe’reto【B2】____
July11Ileftonmytriptoday.Havingbeenoverseasbefore,Ifeltsomewhatateasewiththeideaoftraveling【B1】______.
July11Ileftonmytriptoday.Havingbeenoverseasbefore,Ifeltsomewhatateasewiththeideaoftraveling【B1】______.
July11Ileftonmytriptoday.Havingbeenoverseasbefore,Ifeltsomewhatateasewiththeideaoftraveling【B1】______.
A、805miles.B、1,000miles.C、1,305miles.D、1,500miles.C短文提到,树木为生命提供可能,是因为它们吸收二氧化碳和释放出氧气,使我们能呼吸。故答案为C。根据选项的描述,联系上几道题的选项,可知这道题
A、Heusedallofittoexchangeafreeticket.B、Hetradedhalfofitforfreecoupons.C、Hewenttohavefourfreemealsinar
RainforestCity[A]Apatchoftropicalrainforesthastwicethenumberofmammalspecies,fivetimesthebatsandbirdsandten
随机试题
A.主细胞分泌B.壁细胞分泌C.浆细胞分泌D.G细胞分泌E.黏液细胞分泌免疫球蛋白由
松动牙固定术不能达到的目的是
重大事故、较大事故、一般事故自收到事故调查报告之日起()日内做出批复。
公司违反法律规定,在法定的会计账簿以外另立会计账簿的,由县级以上人民政府财政部门责令改正,处以()万元以上()万元以下的罚款。
在下面哪一种情况下,国债利率可定得高一()。
下列各项因素中,影响经营杠杆系数计算结果的有()。
当合同对履行费用的负担约定不明确时,《合同法》规定:由合同双方当事人分担。()
Writeawelcomingspeechofabout100wordsbasedonthefollowingsituation:DoctorBrown,whoiswellknowntotheworldfor
(13)是一种静态结构描述工具,它是描述系统的模块结构,以及模块之间关系的一种静态结构。它不能像(14)那样,能够从系统流程的角度描述系统的动态特性。(13)能够全面地描述系统模块化的结果,以及各个模块的调用关系。在(13)上,模块的层次关系也是显而易见的
努力が大切です。
最新回复
(
0
)