题目

Can dolphins talk？Maybe they can't talk with words，but they talk with sounds.They show their feelings with sounds.Dolphins travel in a group.We call a group of fish a “school”．They don't study，but they travel together.Dolphins are mammals，not fish，but they swim together in a school.Dolphins talk to the other dolphins in a school.They give information.They tell when they are happy or 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 hprepared, yesterday, he, speech, for, his____________________________________________.