时间:2019-01-09 作者:英语课 分类:高中英语听力人教版第二册


英语课

THE BISON 1 ON THE PLAINS OF AMERICA


The first settlers on the plains of America were Native Americans. They arrived more than. 30,000 years ago by crossing a land bridge from Asia to America. The Native Americans lived by gathering 2 roots, nuts and wild fruit and hunting wild animals.


They hunted bison, a type of wild animals which used to exist in huge numbers on the plains of America. The bison grows to a shoulder-height of 1.5 metres and can weigh 1100 kilogrammes. It was an important part of Native American’s life. Bison were killed for their meat, while their fur provided 3 warm clothing during cold winters. The Native Americans made tents and water containers from the skins and tools from the bones. The teeth were used to make necklaces.


From about 1830 onwards 4 in the USA, European settlers began to move westwards 5. Large groups of Native Americans were forced to move fierce 6 wars between Native Americans and European settlers. The American government made agreements with Native American chiefs but always broke them afterwards. In this way, Native Americans were forced onto poor land that the settlers did not want.


The settlers built railways across the plains and began to hunt even more bison. While early settlers had killed bison for food, now the killing 7 became more widespread 8. They killed the bison skins were sent by rail to cities to be sold. Between 1850and 1910 the bison population is thought to have fallen from 60 million to just a few hundred.


The killing of the bison changed the whole wildlife of the plains. With fewer bison, grass shoots were not eaten, so grass did not grow as strongly. Bison waste no longer fell on the ground to improve the soil, which as a result became less good for growing plants. The ground supported fewer plants, and the insects which lived on these plants died out. There was less food for birds and also for the prairie 9 dog, a kind of animal which lives holes in the ground. This in turn had an effect on the food supply for wolves. Thus one simple fact, a change in number of bison, had an effect on the whole wildlife chain of the plains



n.野牛
  • American bison are very large.美洲野牛非常巨大。
  • Herds of bison live in the park.公园内住有成群的野牛。
n.集会,聚会,聚集
  • He called on Mr. White to speak at the gathering.他请怀特先生在集会上讲话。
  • He is on the wing gathering material for his novels.他正忙于为他的小说收集资料。
conj.假如,若是;adj.预备好的,由...供给的
  • Provided it's fine we will have a pleasant holiday.如果天气良好,我们的假日将过得非常愉快。
  • I will come provided that it's not raining tomorrow.如果明天不下雨,我就来。
adv.前进;在前;在先;迈进
  • From now onwards my teacher will be stricter.从此我的老师会更加严格。
  • The crowd began to move onwards.人群开始向前移动。
adv.西方;西部地
  • We travelled westwards for several days.我们向西行了数日。
  • They were sailing westwards.他们向西航行。
adj.凶猛的,残忍的;狂热的,强烈的
  • The soldiers got ready for a fierce battle.战士们准备进行一场恶战。
  • What he said met with fierce opposition.他的话语遭到激烈反对。
n.巨额利润;突然赚大钱,发大财
  • Investors are set to make a killing from the sell-off.投资者准备清仓以便大赚一笔。
  • Last week my brother made a killing on Wall Street.上个周我兄弟在华尔街赚了一大笔。
adj.广布的,普及的,流传宽广的
  • Plastic is in widespread use.塑料已被广泛地使用。
  • English is a widespread language.英语是一种很普及的语言。
n.大草原,牧场
  • A single spark can start a prairie fire.星星之火,可以燎原。
  • The vast prairie stretches west to the horizon.茫茫大草原向西伸展,直至天边。
学英语单词
Abies dayuanensis
aboukir
acetylalisol
acoustic navigation system
acoustical insulation board
alkyl metal
all-against-all
anthracology
anti-deteriorant
betwist-mountain
Bilečko Jezero
biological oceanography
birth-control campaigners
bloodworks
boom mic
bucket blade
Cai Lay
casadei
cheapener
checkrows
Classic Triad
coated bulb
Copsychus
crohn's
cubed
Cutaneo
daisy chained priority mechanism
delivering information
electro-deposit copper
english-based
febris recurrens europaea
flux monitors
gallery kiln
Gaussian equation
genus Gavia
Glengarry Ra.
go to school to sb
hamart-
highest possible key value
irenina hydrangeae
isoetid
Kampinda
land use survey
lead splash condenser
limit register
Lionel Hampton
log-lin
low-lying placenta
mean volume diameter
membrane modulus
metalepses
methyl n-undecyl ketone
methymethacrylate
mid-parent
mist-detection instrument
msstic tests
multi-stage method of washing
natural exhaust
new jack swing
Noikohis
nozzle tube lever block
nun's cloth
offset bulb
oncurable
one-piece casting
open wire link
orthographers
overrulest
Passive portfolio
paste reactor
peak temperature
pervestigation
photorelay
physical distancemeter
pinus longaevas
porphyry shell
precision measurement
preconsign
premixed gas
pulls
ranajit
reference fringe
relieve sb of
Rhododendron megeratum
rivieras
rr. musculares (n. femoralis)
Salfit
saline diuretic
scintillation decay time
silver(II) oxide
soft toys
starvation of processes
steam trap (upright bucket type)
Stegi
Stromatoporoidea
thallations
transparent electrode
triggered response
universal electron microscope
war machines
Warmeriville
Wellerellacea