among 和 of 在表示“在...之中”时的区别。例如:" While you are the youngest, you are indeed the cleverest of / among my sons," the old merchant said. 那么两者在这个句子中可否互换呢,用在句子开头,又是什么区别呢?
A century is, geologically speaking, a very short period of time. And so is a thousand years.上句中的And so is ...中so 是什么用法和含义? And so is a thousand years 主语省略了吗?so表示强调吗?