課后練習：

1. There are several reasons international trade exists.

A. why B.because C. that D. which

2. Some nations possess natural deposits their own requirements other nations have none.

A. atexcess of; while B. inexcess of; and

C. inextenceof; that D. inexcess of; while

3. With thedevelopment of manufacturing and technology, there

another incentive fornations to exchange their products.

A. arose B. rose C.arise D. rise

4. The theory ofcomparative advantage, also called the comparative cost theory, David Ricardo and other economistsin the nineteenth century.

A. is developed by B. was developed by

C. was developed D. are developed by

5. there areminorrelative differencesin theefficiencyof producing a commodityeven the poor country can have a comparative advantagein producing it.

A. As long as B. As short as C. As soon as

6. This principleis the of specialization into trades andoccupations.

A. base B. basis C. basic D.basses

7. Goods and rawmaterials around the world.

A. have to transpose B. have to be transposed

C. have to aretransposed

(不定式被動語態：to be done)

8. Thus, insurance isanother service some nations specialize.

A. in which B. that C. when D. ofwhich

9. Invisible tradecan be as important to some nations the export of raw materials or commodities isto others.

A. as B. than C. so D.to

現在以“中文形式”出幾道“理閱讀解”題——

1、“窮國在生產上沒有比較優勢”，這句話正確嗎？

錯誤。即使是窮國在生產上也會有比較優勢。

2、國家之間貨物自由流通的另一個障礙是什么？

另一個障礙是：人為的貿易壁壘。例如關稅和配額。

3、文中提及的無形貿易有幾種？分別是什么？

3種，包括運輸服務、保險服務和旅游服務。

4、……你也來為自己出道題吧！