[单项选择]People, Customs and Habits 1. Every ten years the United States makes a complete count, or census, of its people. When the first count was made in 1790, the new nation had fewer than 4 million people, almost all living along the East Coast. Today, there are more than 226 million. 2. We moved slowly through the city and entered a slum district. The streets crowded with people. People eating, people washing, people sleeping. People visiting each other, arguing and screaming. People pushing their hands through the taxi windows begging. People holding on to the sides of buses. People, people, people, people. 3. We have the ability to keep what we have learned in our minds so that we can call it up again for use later on. What we remember in this way may be words, figures, dates, poetry, events in our own lives and things like arithmetic or historic facts, and even skilled actions such as playing the piano or riding a bicycle. 4. Different countries and different races have