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阅读下列短文，从每题所给的四个选项(A、B、C和D)中选出最佳选项。
Imagine you are living in a moving house. Inside the house, there is a kitchen, a bathroom and a bedroom. Although they are much smaller than those at your home, they are easy for you to use.
Nowadays you can see these moving houses on the road in China. They are called recreational vehicles (RVs). People call them "houses on roads". When it's holiday time, the whole family will get into the small home and hit the road for a trip across the country.
Compared to a real house, this "home" on the road is useful for a family. The best thing is that you can do everything you like freely. You can drive as long as you like without worrying about finding hotels and restaurants. Or you can just stop somewhere nice and stay for a few weeks. You may also meet other families that are on road trips. Together, you put up your tents. It's camping time with lots of talk and laughter.
However, RVs are not always convenient(方便的). They can sometimes break down and don't work. You have to spend time fixing them. But many people still like this kind of vehicle because they can go anywhere they want whenever they want.
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