试听90秒5.The oldest sister saw people（赖老师精心解读）

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The next year, the oldest sister turned fifteen. She swam to the surface of
the sea and was amazed by everything she saw. Later, she told her other
sisters about the people, who walked on two legs. She also told them
about their music and their songs. The voices of people were strange to
her. She said mermaids sang much better than people.