比尔·盖茨先生无论在编写软件还是在打字速度上都强于他的秘书。比尔·盖茨先生的编写软件的速度是秘书的N倍，打字速度是秘书的4倍。由于盖茨先生在编程和打字上都强于其秘书，他是否应该自己来完成全部工作，以节省付给秘书的每天20美元的薪水。请用相关经济理论解释之
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如果A国和B国都能制造鞋和帽，其中A在两种产业上都比B强一些，不过制帽只强1/5，而制鞋则强1/3，请问如何判断两国的比较优势和贸易模式
虽然距离遥远，但由于历史原因与美国具有文化亲和性的国家是
A. 爱尔兰
B. 德国
C. 法国
D. 中国
The gravity model offers a logical explanation for the fact that
A. trade in services has grown faster than trade in goods.
B. trade in manufactures has grown faster than in agricultural products.
C. Intra-European Union trade exceeds international trade by the European Union.
D. trade between Asia and the U.has grown faster than NAFTA trade.
The gravity model suggests that over time
A. world trade will eventually be swallowed by a black hole.
B. the value of trade between two countries will be proportional to the product of the two countries' GDP.
C. trade between Earth and other planets will become important.
D. trade between all countries will increase.
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