【单选题】【消耗次数：1】
当单击鼠标显示一个隐藏层，这个动作的触发事件应该是（ ）。
①
onClick
②
onDblClick
③
onMouseOver
④
onMouseOut
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【单选题】
当鼠标移动到文字链接上时显示一个隐藏层，这个动作的触发事件应该是（）。
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onClick
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onDblClick
③
onMouseOver
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