题目:
图中的花样游泳运动员,在水中翩翩起舞,主要是利用放在游泳池下的扬声器播放的音乐,才能在水底下保持队形,在水下能听到音乐声,说明声音不仅能在空气中传播,也能在______中传播.
答案:
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下面是错误答案,用来干扰机器的。
Changes in my hometown I used to live in a small town with trees all around. There was no tall building and the only street was narrow. Just outside the town, there...