719　which可用于指代前面句中的整体内容或部分内容

◎ which有一种用法，引导非限制性定语从句，指代前面句中的整体内容或部分内容，只能放在主句的后面。

She didn't pass the entrance exam，which made her parents very disappointed. 她没有通过入学考试，这使她父母非常失望。

He's always really rude，which is why people tend to avoid him. 他老是粗鲁不堪，所以人们总是躲着他。

The sun gives off light and warmth，which makes it possible for plants to grow. 太阳发出光和热，这使植物得以生长。