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

我选了A，我想知道 or more 和older 怎么区分，我认为 aged more 更合适，怎么会aged older呢？

接路问一句：题干中的compared的逻辑主语是 one baby in four? 可以这样修饰吗？

还是 compared with just one baby in six in 1975做状语修饰整个句子？

one baby in six

one baby in four

1.平行并列，

2.主谓一致，is

3.习惯用法，compared with和compared to

4.分词修饰逻辑主语one baby in four