143.We can never expect ____ bluer sky unless we create ____ less polluted world.
A.a;a
B.a;the
C.the;a
D.the;the
144.In order to find ____ better job,he decided to study ___ second foreign language.
A.the;a
B.a;a
C.the;the
D.a;the
143.答案是A，考查冠词，sky和world前面有形容词修饰时，用不定冠词。
144.答案是B，考查冠词，第一空格为泛指；第二空格a+序数词+名词，表示“又一，再一”。
