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