many people who have done this feel that it is a big mistake. They don't make so much money and there isn't much work to do. People in the countryside are different and aren't always very friendly. As a result, quite a lot of people who have moved to the countryside move back to the city. "It's wonderful to see crowds in the streets and cinema lights." they say.

25. Which is NOT the reason for people moving to the cities in China?

　　A. The countryside is much poorer than the city.

　　B. People in the countryside have nothing to eat.

　　C. People in the countryside don't have much work to do there.

　　D. Services in cities are usually much better than those in the countryside.

26. Why do some rich families in Europe move to the countryside?

　　A. Because they will find good jobs.

　　B. Because they like feeding sheep and cows in the green fields.

　　C. Because they can make more money there.

　　D. Because they are tired of living in the city.

27. The best title of this passage may be"________________".

　　A. Moving Out or Moving back

　　B. Living in the City

　　C. Living in the Countryside

　　D. Living a Happy Life

　　C

　　For centuries, dolphins have got our admiration, and it is easy to see why. They are beautiful, cute and smart sea animals. Dolphins are not fish, but warm-blooded animals. They live in groups, and speak to each other in their own language. In this way, they are like other animals, such as bees and birds. But dolphins are very different from almost all land animals. It is said that dolphins are the world's second brightest creatures after humans and have many brain features related to intelligence. Their brain is nearly the same size as our own, and they live a long time―at least twenty or thirty years.

Like some animals, dolphins use sound to help them find their way around. They also make these sounds to talk to each other and to help them find food. We now know they do not use their ears to receive these sounds, but the lower part of the mouth, called the jaw.