【简答题】Maria can read 20 pages of economics in an hour. She can also read 50 pages of sociology in an hour. She spends 5 hours per day studying. a. Draw Maria’s production possibilities frontier for reading ...
【简答题】补全对话。 A: Hello. 1 ___________? B: Yes, this is Maria speaking. A: Maria, 2 ___________? I can't remember. B: We have English, math, Chinese and PE in the morning. Then History and computer in the afte...