Can dolphins talk? Maybe they can't talk with words, but they can talk with sounds. They show their feelings with sounds.
Dolphins travel in a group. We call a group of them a “school”. They don't study, but they travel together.
Dolphins talk to each other in the school. They give information. They tell other dolphins when they are happy, sad or afraid. They say “welcome” when a dolphin comes back to the school. They talk when they play.
They make a few sounds above water. They make many more sounds under water. People can't hear their sounds because their sounds are very high.
Sometimes people catch dolphins for large aquariums (水族馆). So they can watch dolphin shows in the aquariums. Dolphins don't like to be in an aquarium, being away from their school. They are sad and lonely if they do so.
There are many stories about dolphins. They help people. Sometimes they save people's lives. Many people believe that dolphins can bring them good luck.
根据短文内容,判断正误。
26. Dolphins can talk and show their feelings with sounds.
27. Dolphins make more sounds above water than under water.
28. Dolphins' sounds are very high, so we can't hear them.
29. Dolphins will feel happy if they are away from their school.
30. Dolphins can save people's life and may bring good luck.