阅读 " p8 M. [: ^6 |8 `" z/ ?
美国东北部由于靠海水路发达 水还可以提供power，因此城市发展早，成为工业中心，本来也有很多人从事农业，但是他们的土地并不适合农业，再在上内陆地区农业发展好，竞争大，很多人就开始从事纺织了，后来有铁路了，西边的矿产可以运到东边来，同时也促进了铁路沿线城市的发展，说南部地区一直发展农业，经济不发达，有钱人少
- s$ ]$ \; Q1 t Agriculture andanimal domestication % w- B9 u6 }" o& Q+ g7 G* Z
The firstevidence for the existence of agricultural practices in South America datesback to about 9000 BC, when squashes,chillies and beans began tobe cultivated for food in the highlands of the Amazon Basin. Potteryevidence further suggests thatmanioc, which remains a staple food today,was being cultivated as early as 2000 BC. ' z* M# I( }/ A( p5 m
By 2000 BC,many agrarian villagecommunities had been settled throughout the Andes and the surrounding religiousregions. Fishing became a widespread practice along the coast, helping establishfish as a primary source of food. Irrigation systems were also developed atthis time, which aided in the rise of an agrarian society. D4 ]+ u' P! `% W9 m
South Americancultures began domesticating llamas, vicuñas, guanacos, and alpacas in thehighlands of the Andes circa 3500 BC. Besides their use as sources of meat andwool, these animals were used for transportation of goods ( K2 c& i" {2 p$ l3 d
听力
0 W5 Z. _1 f0 c. u2 R# W; h 有个策略叫做seller market ,价格的高低取决于需求量 讲一个民族 他们有一种otter sea身上的某种东西 亚洲很多人喜欢 后来价格越来越高 原因是因为他们采用了一些策略 一是竞价 价高者得之 而是拖延谈判时间 导致买者迫不及待 出高价Sea otter
% m. ~ b. U% @2 Y s9 r& g( e9 W Sea otters (Enhydra lutris) live along the Pacific coast ofNorth America. Their historic range included shallow waters of the Bering Strait and Kamchatka, and as far south as Japan. Sea otters have about26,000 to 165,000 strands of hair per squarecentimetre of skin, a rich fur for whichhumans hunted them almost to extinction. By the time the 1911 Fur Seal Treaty gave themprotection, so few sea otters remained that the fur trade had becomeunprofitable. Sea otters eat shellfish and other invertebrates (especially clams, abalone, and sea urchins), frequentlyusing rocks as crude tools to smash open shells. They grow to 1.0 to 1.5 metres (2.5 to5 ft) in length and weigh 30 kilograms. Although once near extinction,they have begun to spread again, from remnant populations in California and Alaska. $ B" Z# X" b. \$ Z0 f
Unlike most marine mammals (such as seals or whales), sea ottersdo not have a layer of insulating blubber. As withother species of otter, they rely on a layer of air trapped in their fur, whichthey keep topped up by blowing into the fur from their mouths. They spend mostof their time in the water, whereas other otters spend much of their time onland.
. l5 C( r7 l2 Q 碰到听力加试 后面的段子：
d- ]& z7 x( R2 b X: G 1.教授说要去看一个博物馆说博物馆重新摆放了一下 空间更大了更容易观看了 ，提到了一个特殊的值得观看的物品，是古罗马的，但风格受到希腊的影响，不记得了后面了 $ C2 K: V' ~) f( I/ }
2.一个学生 要搞一个watching Bird event ， 但是学校不允许，这个学生就说要搞个俱乐部，学校说只能提供网站，没有固定教室开会，但是可以提供临时教室供occasional case，然后学校里有个教授搞的关于鸟的研究，说学生可以和教授交流一下
+ |+ B$ ] K; [ 3.一个洗衣房被改进了 要加钱 |
发表于 2012-8-14 22:15:45
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