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标题: GWD17-Q38 [打印本页]

作者: nikema    时间: 2006-11-5 06:52     标题: GWD17-Q38

GWD17-Q38:

All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.

 

 

  1. a single ancestor’s who is thought to have lived
  2. a single ancestor’s who was thought to live
  3. a single ancestor whom it is thought had lived
  4. the Y chromosome of a single ancestor who is thought to have lived
  5. the Y chromosome of a single ancestor whom it was thought had lived

为什么答案是D,请帮助。谢谢。


作者: himba    时间: 2006-11-5 20:22

这道题说的是今天的Y染色体是以前一个祖宗的染色体的后代,而那个祖宗生存的年代是about 140,000 years ago. A跟B说的都是以前祖宗的染色体lived about 140,000 years ago,C说的是Y染色体是以前的祖宗,所以这三个都不对。E的whom it was啰唆,且it不知道指谁。相对之下D就非常清楚了






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