阅读理解。 Families and cars Americans with small families own a small car or a large one. If both parents are working, they usually have two cars. When the family is large, one of the cars is sold and they will buy a van (大蓬 货车). A small car can hold four persons and a large car can hold six persons but it is very crowded. A van can hold seven persons easily, so a family with three children could ask their grandparents to go on a holiday travel. They could all travel together. Mr. Hagen and his wife had a third child last year. This made them sell a second car and buy a van. Its sixth and seventh seats are used to put other things, for a family of five must carry many things when they travel. When they arrive at their grandparents' home, the things are brought into the two seats, and then it can carry the grandparents. Americans call vans motor homes. A motor home is always used for holidays. When a family are traveling to the mountains or to the seaside, they can live in their motor home for a few days or weeks. All the members of a big family can enjoy a happier life when they are traveling together. That is why motor homes have become very popular. In America there are many parks for motor homes. 根据短文内答问题。 1. How many people can a van generally hold? ________________________________________________ 2. What did Mr. Hagen and his wife do after they had a third child? ________________________________________________ 3. What do Americans call vans? ________________________________________________ 4. What do Americans usually use motor homes for? ________________________________________________ 5. There aren't many parks for motor homes, are there? ________________________________________________