Today we went to the store with Professor.

Q: What’s this place?

A: It’s a store.

Q: Who is he?

A: He is the customer.

Q: What does the customer want to buy?

A: He wants to buy a cuckoo clock.

Q: What’s this?

A: It’s a price tag. Price tag can show us the price.

Q: How much does the cuckoo clock cost?

A: The cuckoo clock costs 17 cents.

Q: How many coins can make up 17 cents?

A: 1 dime, 1 nickel and 2 pennies can make up 17 cents. Because 1 dime is 10 cents, 1 nickel is 5 cents, 2 pennies are 2 cents, so they can make up 17 cents.

Q: What does this customer want to buy?

A: He wants to buy an accordion.

Q: How much does the accordion cost?

A: The accordion costs 25 cents.

Q: How many coins can make up 25 cents?

A: 1 dime and 3 nickels and make up 25 cents. Because 1 dime is 10 cents, 3 nickels are 15 cents, so they can make up 25 cents.

A: 5 nickels can make up 25 cents because 5 nickels are 25 cents.

A: 1 quarter can make up 25 cents because 1 quarter is 25 cents.

Q: What does this customer want to buy?

A: He wants to buy an umbrella.

Q: How much does the umbrella cost?

A: The umbrella costs 11 cents.

Q: How much is one dime and one nickel?

A: One dime and one nickel are 15 cents.

A: We can trade five pennies for one nickel, so one dime and five pennies are 15 cents.

Q: How many coins can make up 11 cents?

A: 1 dime and 1 penny can make up 11 cents. Because 1 dime is 10 cents and 1 penny is 1 cent.

顾客去Professor开的小卖部买一些物品，学生们需要帮助顾客兑换正确价值的钱币，从而考察学生对每种硬币价值的掌握以及如何去兑换相同价值的硬币。

【语音作业】：以Chris的语音为辅助，尝试自己读复习文档中的句子；