请听下面一段材料,回答第1至4题。 1. What does the speaker want to tell the audience about? [ ] A. Some kinds of money used in the early days. B. The things which will serve as money in the future. C. The development of money. 2. What might have been used for money by early Japanese according to the speaker? [ ] A. Salt. B. Tea. C. Nuts. 3. Who used the first coins in the world? [ ] A. The EuroDeans. B. The Chinese. C. The American Indians. 4. What is the common character of the things used for money? [ ] A. Difficult to get. B. Being used widely in daily life. C. Being valued highly by most people.