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558 one of four babies（A）\one babies in four（C） 和 are主谓不一致。但是记得OG中有一例（89）同样的形式要求谓语是一开始是单数，但后边比较补出的却是复数（正确答案C项），这怎么会事呢？
558.One of four babies are now born to mothers aged thirty years or more, compared with just one of six born in 1975.
(A) of four babies are now born to mothers aged thirty years or more, compared with just one of six born
(B) of four babies is now born to a mother whose age is thirty or older, compared to just one of six babies who were born
(C) baby in four are now born to mothers aged thirty or older, compared to just one in six
(D) baby in four is now born to a mother aged thirty or older, ?compared with just one in six（D）
(E) baby in four is now born to mothers aged thirty years or more, compared to just one in six
OG89
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
(E) every thirty-two pupils now has one microcomputer, four times as many as
Choices A, B, and C appropriately use the construction "one X for every thirty-two Y's" to describe the ratio of computers to pupils, but only C, the best answer, is error-free. In A, are does not agree with the subject, one microcomputer; furthermore, in A, B, and D, than is used where as is required. Choices D and E reorder and garble the "one X ..." construction, making four times as many refer illogically to pupils. | 
