单项选择题 庄子认为，（）是艺术的本源。

单项选择题 16. Unemployment would cause an economy to a. produce inside its production possibilities frontier. b. produce on its production possibilities frontier. c. produce outside its production possibilities frontier. d. experience an inward shift of its production possibilities frontier. A、aB、bC、cD、d

单项选择题 2. Brenda is an excellent baker and Floyd has a plentiful farm. If Floyd trades eggs and butter to Brenda for some of Brenda’s bread and pastries,