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边际效用递减规律告诉我们，理性的人不可能只吃一种食物充饥。
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消费者剩余是买者的支付意愿减去卖者的生产成本。
Task 1You will hear a telephone conversation between a caller and a receptionist.Listen and complete the telephone message by filling in the blanks. Write only ONE word or number for each blank.You will hear the conversation TWICE.MessageSubject: Making 1) _____Date: 2) _____ of MayArrangement: Sandy handles booking for 3) _____ roomsTony handles executive accountsCaller's name: Mr. 4) _____Caller's telephone number: 5) 660-843- _____Task 2You will hear a report about China's coffee upstart Luckin overtaking Starbucks.Listen and complete the note by filling in the blanks. Write only ONE word or number for each blank.You will hear the talk TWICE.Luckin Coffee Tries to Overtake StarbucksStarbucks Coffee: Founded in Seattle U.S.A. in 6) _____Having 7) _____ stores in 50 countriesOpening its 8) _____ service since 2018Luckin Coffee: Founded in Xiamen City, China in 9) _____Consumers can get their coffee in 18 minutes without stepping out of their 10) _____[音频]
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化学性实验废液要回收并集中存放，不可倒入下水道
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