scientists are reaching for the oldest tree alive because it

scientists are reaching for the oldest tree alive because it can teach them a great deal
about many matters,分析成分

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从句子成分上分析,主句是一个主谓宾结构,because 引导的原因状语从句做从句部分,从句部分也是一个主谓宾结构,it做主语can teach 作谓语,them 作宾语,a great deal 作表示程度的状语,
主句scientists,做主语,are teaching for 作谓语,tree作宾语,the oldest 和alive作tree的前致后致定语.
成分就是这样,如君所愿,幸不辱命!

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it can help them to analize the compositionof the oldest tree.

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