179.While income worry is ____ rather common problem of the aged,loneliness is another problem that ___ aged parents may face.

A.a;不填

B.the;不填

C.a;the

D.the;the

180.Education is a lifelong process,____ process that starts long before ____ start of school,and one that should be ____ necessary part of one's entire life.

A.a;a;a

B.a;the;a

C.the;a;the

D.the;the;the

179.答案是A；

考查冠词用法，第一空a rather common problem 一个相当普遍的问题；第二空泛指老年父母，前面不用冠词。

180.答案是B；

考查冠词，第一空泛指一个过程，在句子中做同位语；第二空特指学校生活的开始；第三空泛指一个必不可少的部分。