The principle of comparative advantage is derived from a highly simplistic two good/two country model. A: One good/one country model B: two good/two country model C: multiple good/multiple model D: fixed good/fixed model

CARS model of an introduction means __________________ model.

This model is our ________________（最新的）model.

Which of the following statement is true?____. A: The ability to use language separates human beings B: We can be certain that animals have a culture too C: Social scientists doubt if animals have a culture too D: Some traditional ideas about the difference between human beings and animals may be wrong

生物医学模式(biomedical model)的贡献与局限是什么？