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（2）觀眾像著了魔一樣，忽然變得鴉雀無聲。
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2.歌聲是無形的，作者為什麼說“像珠子似的”“一粒一粒地滾下來”？“回音”既然“聽不見”，又怎麼能“淹沒”“狂暴的掌聲”？
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3.第一自然段在全文中有什麼作用？
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4.你如何理解最後一句話。
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