1)—What is the most useful thing when it is used up? —An umbrella.2)—You can’t buy it in a store.It’s delivered to your house,and you use it every day.What is it? —Electricity.
文摘1)—What is the most useful thing when it is used up? —An umbrella.2)—You can’t buy it in a store.It’s delivered to your house,and you use it every day.What is it? —Electricity.