poor as Paul was ),he remained honest.为什么poor as放在句首?

as引导让步状语从句时,用倒装句式,此时as表示“虽然”“尽管”.
倒装形式：“强调对象＋as＋主语＋其它部分”
强调对象可以是表语(名词,形容词)或状语(副词).
表语为名词时,前面通常不用冠词.
eg:
Tired as he is,he goes on with his work.
Much as he likes her,he does get irritated with her sometimes.
Child as he is,he knows how to please the others.

因为这个as表示的是though的意思，为 虽然，是一个让步状语丛句