时间:2018-12-30 作者:英语课 分类:托福听力短文


英语课
(MA) Look at our topographical map and you'll see that the middle third of the North American continent --- from the Rocky Mountains almost to the Mississippi River --- is pretty flat. This is the Great Plains. This kind of area is sometimes called a prairie, sometimes a steppe. That's [ess-tee-ee-pee-pee- ee]. The defining features are level terrain 1, dry climate, and an absence of trees. The Great Plains are actually the former bed of shallow inland sea. Over millions of years, sediment 2 left by glaciers 3, water, and wind smoothed out the dry sea bed.

As I said, the Great Plaints are bordered on the west by the Rocky Mountains. And it's really the Rockies that are responsible for the formation of the grasslands 4. The mountains are so high that they block the heavy moist air traveling eastward 5 form the Pacific Ocean. Lighter 6, drier air passes over the mountains. Until people intervened with irrigation and farms, only grass could grow on the dry, windy plain. In fact, we can divide the Great Plains into three zones. In the west, where it's driest and windiest, the grass is very short. In the eastern zone, there's more rain and grass grows as high as 360 centimeters. In the middle third, there's a mix of grass species that grow to an intermediate height.


n.地面,地形,地图
  • He had made a detailed study of the terrain.他对地形作了缜密的研究。
  • He knows the terrain of this locality like the back of his hand.他对这一带的地形了如指掌。
n.沉淀,沉渣,沉积(物)
  • The sediment settled and the water was clear.杂质沉淀后,水变清了。
  • Sediment begins to choke the channel's opening.沉积物开始淤塞河道口。
冰河,冰川( glacier的名词复数 )
  • Glaciers gouged out valleys from the hills. 冰川把丘陵地带冲出一条条山谷。
  • It has ice and snow glaciers, rainforests and beautiful mountains. 既有冰川,又有雨林和秀丽的山峰。 来自英语晨读30分(高一)
n.草原,牧场( grassland的名词复数 )
  • Songs were heard ringing loud and clear over the grasslands. 草原上扬起清亮激越的歌声。 来自《现代汉英综合大词典》
  • Grasslands have been broken and planted to wheat. 草原已经开垦出来,种上了小麦。 来自《简明英汉词典》
adv.向东;adj.向东的;n.东方,东部
  • The river here tends eastward.这条河从这里向东流。
  • The crowd is heading eastward,believing that they can find gold there.人群正在向东移去,他们认为在那里可以找到黄金。
n.打火机,点火器;驳船;v.用驳船运送;light的比较级
  • The portrait was touched up so as to make it lighter.这张画经过润色,色调明朗了一些。
  • The lighter works off the car battery.引燃器利用汽车蓄电池打火。
学英语单词
act sequences
age equivalent
aged grain
anthophiles
antiedematous
armature spinder
arrhenius theory of dissociations
arris-wise
as per
Ban Phran Katai
barrier region
basted
batchwise dyeing
be beyond sufferance
belt transect method
ber function
bring up sb.before the court
bulb angle (ba)
cervix dilator
chain cleavage
Chekhovian
chromatomyia horticola (gouraeu)
circular sector
climatological front
cocum
code path
compensation for removal
deepwater production
dry autogenous mill
eighthour
electropioscopy
fast patrol craft
field station
Galium serpylloides
gas ingestion
genus albucas
illaudable
illin'
improvement of sanitation for labo(u)r
insulating moulding plastic
kylit
leaf spine
load monitor
lothrop
ls-dyna
m. transversus lingu?
magnetic inspection equipment
man-computer
mediumistic writing
megaloschizonts
metastable-helium magnetometer
multiple transistor
offas
oligophagous
optic neuropathy
oriental alabasters
oversexualize
penis envy
perbole
point singularity
poufter
prop puller
Prunus triflora
pseudo-dipteral building
pseudoporphyria
Q-ball
raiseabler
sagest
salmon-fishings
scheduled trajectory
scratch pad memory
sequential scheduling
setumot
shonn
smashing
St Mihiel
stage-one
statistical probability theory
store-and-forward status save area
subnormal frequency
supplementer
Takatiho
Taliacotian
taper-shank bridge reamer
telefelony
tenonotomy
tomberel
Torshälla
Trachurus trachurus
train-pipe
trepanners
tricone mill
tubular thrust chamber
turnover study
unalaska
unhypothesised
uniform resource identifier
visual tension
vxl
wellmounted
youngmen
zigzag metaphase