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填空题
Because light travels (fast) ____ than sound, lightning is seen before thunder(雷) is heard.

参考答案

参考解析
解析:
本题考查副词的比较级。句意:由于光传播的速度比声音快,所以我们先看到闪电后听到雷声。than提示此处应为比较,因此要用fast的比较级faster。
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