It's amazing how quickly people adapt environment .how这个疑问副词在句中作什么成分

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It's amazing how quickly people adapt environment .how这个疑问副词在句中作什么成分
Previous to leaving for France,he studied a lot.标明各单词在句中所做成分

How在这里是个感叹词.多么的意思,修饰quickly全句的意思是人类这么快的适应环境的能力是多么令人称奇啊!What和How都会用来做感叹助词,不同的是what后面加名词,how后面加形容词副词.比如:What a day!多棒的一天啊!Ho...