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13. According to scientists at the University of California, the pattern of changes that have occurred in human DNA over the millennia indicate 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.
(A) indicate the possibility that everyone alive today might be descended from a single female ancestor who
(B) indicate that everyone alive today might possibly be a descendant of a single female ancestor who had
(C) may indicate 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（D）
(E) indicates that everyone alive today might be a descendant from a single female ancestor who
这道题我查了一下，没人问是不是太简单了？ 为什么不能选E？
may be, might be? of ,from? D 和E的区别？
还有一个问题是OG－89
89. A recent national study of the public schools shows that there are now one microcomputer for every thirty-two pupils, four times as many than there were four years ago.
(A) there are now one microcomputer for every thirty-two pupils, four times as many than there were
(B) there is now one microcomputer for every thirty-two pupils, four times as many than there were
(C) there is now one microcomputer for every thirty-two pupils, four times as many as there were
(D) every thirty-two pupils now have one microcomputer, four times as many than there were（C）
(E) every thirty-two pupils now has one microcomputer, four times as many as
想问答案E中的has 对吗？还是have? 谢谢先了！ | 
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发表于 2005-3-11 23:31:00
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