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

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
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

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!How fantastic!多好啊,多难以想象啊!
Previous to leaving for France,he studied a lot
在出发去法国之前,他学习了很多.
He studied a lot是主句,he是或主语,study是谓语（过去时）,a lot是补语,表达学了很多,学得很努力.
Previous to leaving for France,是时间状语,previous to是介词,在.之前； leaving for France是动名词做介词宾语,出发去法国