文档介绍：Unit Three
Text A
Why Nations Trade
Unit Three Text A
1
By Linda Yu
Text A Why Nations Trade
Pre-reading Task
Related Information
Detailed Study
Summary&Outline
Home Assignment
Unit Three Text A
2
By Linda Yu
Pre-reading Task
Do you agree with the following statements:
Trade among countries allows people in each country to use their energies in doing what they do best.
Specialization is harmful to a country’s economy.
Unit Three Text A
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By Linda Yu
1. exchange:
n. ①. 电话总机之交换台.
②. 交换, 互换
give A in exchange for B
. He gave me an apple in exchange for a piece of cake.
v. to give or receive something/someone of the same type or of equal value in return for another. 交易, 交换
. He exchanged the blue sweater for a red one
All exchanged seats with Ben.
exchange A for B, 把A换成B
. Where can I exchange my dollars for pounds?
cf. return A for B, 退A换取B trade A for B, 用A 来交换B
exchangeable a. 可交换的
2. product n.
①. 产品
. Important products of South Africa are fruit and gold.
②. 结果
. Criminals are sometimes are products of bad homes.
production n. 生产, 产生, 制作, 影片, 艺术作品
Unit Three Text A
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By Linda Yu
productivity n. 生产力
productive a. 多产的, 产生…的, 生产性的
produce v. 生产, 制造.
       3. import
v. 输入, 进口
. pany sells imported silk.
n. 输入(品), 进口(品)
. In order to take its revenges on Japan, this country stopped the import of its agricultural product.
export v./ n. 输出, 出口
4. efficient a. working or operating quickly and effectively in anized way
效率高的, 能胜任的(所表”效率”着重于有技巧和节省精力方面, 通常用于人)
. The city’s transport system is one of the most efficient in Europe.
We need someone really efficient who anize the office and make it run smoothly.
cf. effective: 1) producing the result that was wanted or intended 2)start officially
有效的, 生效的(强调”实际上产生的效果”或”具有产生效果的能力”)
. It’s a very effective cure for a headache.
The new law will e effective next month.
Unit Three Text A
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By Linda Yu
efficiently ad. 效率高地
efficiency n. 功效, 效率, 效能