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  3. Recently discovered fossil remains strongly suggest that the Australian egg-laying mammals of today are a branch of the main ste

Recently discovered fossil remains strongly suggest that the Australian egg-laying mammals of today are a branch of the main ste

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问题 Recently discovered fossil remains strongly suggest that the Australian egg-laying mammals of today are a branch of the main stem of mammalian evolution rather than developing independently from a common ancestor of mammals more than 220 million year ago.
选项 A、rather than developing independently from
B、rather than a type that developed independently from
C、rather than a type whose development was independent of
D、instead of developing independently from
E、instead of development that was independent of
答案B
解析 本句同样是一个并列结构，即“are sth．rather than sth…”，“是某物而不是另一物”，根据并列连词的形式对等原则，A、D错。在rather than(instead of)之后用的是动名词短语，而are之后是名词a branch，形式不对等。B、C、E从形式上都满足对等原则。再根据句意，发现E中的a development与are后的a branch虽都是名词，但却不属同一类范畴。A branch指一类动物，是具体名词，a development指一抽象动作，从性质上两者不对称，排除E。在B、C中，根据句意，存在着一个相比较关系，简化后B成为：A type developed independently from acommon ancestor；而C为a type’s development independent of a common ancestor，显然C中的比较是不对等的。a type(指一类动物)与a common ancestor属同类，而development与a commonancestor不属同类。
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