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  3. According to scientists at the University of California, the pattern of changes that have occurred in human DNA over the millenn

According to scientists at the University of California, the pattern of changes that have occurred in human DNA over the millenn

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问题 According to scientists at the University of California, the pattern of changes that have occurred in human DNA over the millennia indicates the possibility that everyone alive today might be descended from a single female ancestor who lived in Africa sometime between 140,000 and 280,000 years ago.
选项 A、indicates the possibility that everyone alive today might be descended from a single female ancestor who
B、indicates that everyone alive today might possibly be a descendant of a single female ancestor who had
C、may indicates that everyone alive today has descended from a single female ancestor who had
D、indicates that everyone alive today may be a descendant of a single female ancestor who
E、indicates that everyone alive today might be a descendant from a single female ancestor who
答案D
解析 A中：主句中possibility与从句中的might形成了同义重复，B中might与possibly同样是同义重复。C中：本应用来修饰从句谓语动词的may改为了修饰主句谓语动词indicate，句意改变。同时，B、C中who从句中用过去完成时是毫无根据的。在本句中，might仅表示一种可能性，并非may的过去时，两者在表达可能性上是等价的。D、E主要区别是：descendent之后用of还是用from。一般来说，表“血缘、隶属关系”用介词of，而表“来源”关系应用from。此句中descendent和ancestor之间是一种血缘关系，因而应选D而不是E。(from与of的区分问题)
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