Lesson 42 Recording an earthquake记录地震First listen and then answer the following question.听录音，然后回答以下问题。What does a pen h

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Lesson 40 Waves海浪First listen and then answer the following question.听录音，然后回答以下问题。What false impression does an ocean w

Lesson 40 Waves海浪First listen and then answer the following question.听录音，然后回答以下问题。What false impression does an ocean w