SAT 语法题9.The eerie sons of humpback whales often lower in pi

SAT 语法题
9.The eerie sons of humpback whales often lower in pitch and longer than birds,are intriguing to scientists partly because whales have no functional vocal cords.
A.as it is now
B.the eerie songs of humpback whales,which are often lower in pitch and last longer than birds
C.humpback whale’s eerie songs,often pinched lower and longer than that of birds
D.the eerie songs of humpback whales,often lower in pitch and lasting longer than those of birds.
E.often being lower in pitch and lasting longer than birds,the eerie songs of humpback whales
4.
In the belief that crossword puzzles stimulated her mind,Dolores will spend hours on them every week.
为什么把will 改成would
Today more and more women are becoming doctors,lawyers,engineers,chemists,(or other professions)
空格里填or other professions但是我觉得or professionals in other field和 or in other professional fields也没问题啊