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life began on the earth is one of the b...

 life began on the earth is one of the biggest puzzles to scientists.

    A.How              B.What             C.Where            D.That

 

 [解析]:答案:A考点:名词性从句。连接词的选择考查。句意为:“生命在地球上如何开始的?”。此题容易选择B,误认为感叹句,感叹名词life,误选B。
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