s thrown away\rD. before it is thrown away\r()5. From the passage we know that _ .\rA. a few years ago, there was no smog at all\rB. today people don't have to talk to each other in a loud voice\rC. we can drink water from the polluted rivers and lakes\rD. people are making rules in order to fight pollution\r开心一笑\r一次物理考试\rA physics Examination\rOnce in a physics examination, Nick finished the first question very soon,\rwhile his classmates were thinking it hard.\rThe question was: When it thunders why do we see the lighting first, then\rhear the thunderrolls?\rNick's answer: Because our eyes are before ears.\r一次物理考试\r在 一 次物理考试时，当同学们 都还在苦思冥想时 ，尼 克很快就答好了第\r一个问题 。\r这个问题是：为什么在打 雷 时，我们总是先看到闪 电后 听 到雷声 ？\r尼克 的回 答是 ： 因为 眼睛在前， 耳朵在后 。\r219
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