and this newspaper believes that,as an insurance policy against a catastrophe that may never happand this newspaper believes that,as an insurance policy against a catastrophe that may never happen,the world needs to adjust its behaviour to try to ave

and this newspaper believes that,as an insurance policy against a catastrophe that may never happand this newspaper believes that,as an insurance policy against a catastrophe that may never happen,the world needs to adjust its behaviour to try to ave
and this newspaper believes that,as an insurance policy against a catastrophe that may never happ
and this newspaper believes that,as an insurance policy against a catastrophe
that may never happen,the world needs to adjust its behaviour to try to avert
that threat.
as 是否引导非限定性定语从句?

and this newspaper believes that,as an insurance policy against a catastrophe that may never happand this newspaper believes that,as an insurance policy against a catastrophe that may never happen,the world needs to adjust its behaviour to try to ave
不是.
楼主可以分析一下它的结构：an insurance policy against a catastrophe that may never happen
很明显,that may never happen是定语从句修饰前面的a catastrophe,而against a catastrophe是一个介词短语,前面又只是一个名词结构an insurance policy.
整个成分根本就不是一个句子,它只是一个由两个定语成分叠加修饰的名词短语而已.
所以,as引导的不可能是非限制性定语从句,只是一个名词短语.

上面的老师说得对：as is a prep. here, not a conj. (or ad.) ， 此时as 是一个介词不是连词性质，as an insurance policy against a catastrophe that may never happen在句子中作插入语,

Comparing these sentences:
eg.She is beau...

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上面的老师说得对：as is a prep. here, not a conj. (or ad.) ， 此时as 是一个介词不是连词性质，as an insurance policy against a catastrophe that may never happen在句子中作插入语,

Comparing these sentences:
eg.She is beautiful, as we all knows. She is so talent that, as a inherent gift which was from her mother, everyone konws her.
前一个句子的as 是连词引出的是一个非限定性定重，后一个句子的as是prep. +n.+which（作了重句的主语）引导的定语从句，在整个句子中作插入词，起说明的作用。
actually实际上我第二个句子和你上句很一样：你上句中的连词and this newpaper lelieves that the world needs to adjust its behaviour to try to avert that threat,as an insurance policy against a catastrophe that may never happen.(that后是一个宾词从句,你看as ……也可放后作补充说明)

建议：有时在学词法过程中要结合单个词的词性用法同时学习

学语法要是对英语感兴趣而不是为了考试，可以选用一本很厚很全的书去学习（一般厚的语法书会全一些，也可以同时参都3--5本语法书作对比的学，这样就会更通畅）
Be careful, the purpose of learning a language is not to pass the exam only. We should understand the important of communicating with foreigners , so we should pay more attention to our pronunciation and oral English.Of course, the grammar and vocabulary are the basic knowledges.

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