听下面一段材料,回答第1至3题。 1. Which day is the busiest day in the supermarket? A. Friday. B. Saturday. C. Sunday. 2. Why do the supermarkets provide carts for their customers? A. Because they want their customers to buy more. B. Because no one will help the customers to carry their goods. C. Because babies cry a lot without the carts. 3. How many times does the average American housewife go to the supermarket each week? A. Once. B. Twice. C. Three times.