A physics Examination

　　Once in a physics examination, Nick finished the first question very soon, while his classmates were thinking it hard. The question was: When it thunders why do we see the lighting first, then hear the thunderrolls? Nick\'s answer: Because our eyes are before ears.

　　一次物理考試

　　在一次物理考試時，當(dāng)同學(xué)們都還在苦思冥想時，尼克很快就答好了第一個問題。這個問題是：為什么在打雷時，我們總是先看到閃電后聽到雷聲? 尼克的回答是：因為眼睛在前，耳朵在后。