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.

　　在一次物理考試時(shí)，當(dāng)同學(xué)們都還在苦思冥想時(shí)，尼克很快就答好了第一個(gè)問(wèn)題。

　　這個(gè)問(wèn)題是：為什么在打雷時(shí)，我們總是先看到閃電后聽(tīng)到雷聲?

　　尼克的回答是：因?yàn)檠劬υ谇�，耳朵在后�?/p>