Which of the following does the author recommend to a person who wants to be a teacher?
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【判断题】Each seller of a product is willing to sell as long as the price he or she can receive is greater than the opportunity cost of producing the product.