Q30:

According to public health officials, in 1998 Massachusetts became the first state in which more babies were born to women over the age of thirty than under it.

1. than
2. than born
3. than they were
4. than there had been
5. than had been born

Please teach how to judge between A & B? thanks!

129. As a result of the continuing decline in the birth rate, less people will enter the labor force in the 1980’s than did in the 1960’s and 1970’s, a twenty year period during which people born after the war swelled the ranks of workers.

(A) less people will enter the labor force in the 1980’s than

(B) less people will be entering the labor force in the 1980’s as

(C) fewer people will enter the labor force in the 1980’s as

(D) fewer people will be entering the labor force in the 1980’s as（E）

(E) fewer people will enter the labor force in the 1980’s than

谓语动词可以省略么？

如果前面是do in 2000's，后面可以是will(do) in 2010's

如果前面是will do in 2010's,后面当然只能是did in 1990's

搜了搜Boston Magazine的记载：

 In 1996, Massachusetts became the first state in which more babies were born to women 30 and older than to women under 30, and the trend has only escalated since. 

比较一下看看。