Alice shouted into the cave calling for her brother,but the only sound she heard was the echo of her own voice bouncing off the stone walls. 题目和参考答案——青夏教育精英家教网—

6. Alice shouted into the cave calling for her brother,but the only sound she heard was the echo of her own voice bouncing off the stone walls.( )

6. 回声句中echo= voice bouncing off the stone walls ,即"回声"。

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