Dolphins are very smart animals. They even have their own language. They talk to each other with clicks, whistles, and grunts. Scientists have been studying this dolphin language. They hope that in the future, people and dolphins will be able to talk to each other. This paragraph mainly tells:
A. how dolphins talk to people
B. how smart dolphins are
C. how dolpins are different from fish
D. which scientists are studying languages
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