As is known to us all travelling all over the world is out ofquestion withoutpassport.A.

问题补充：

As is known to us all, travelling all over the world is out ofquestion withoutpassport.

A. a; the

B. 不填，不填

C. the; a

D. the; an

答案：

A. a; the

B. 不填，不填

(答案→)C. the; a

D. the; an

解析：这题考查冠词的用法：第一空填the，out of the question“不可能’,第二空填a，泛指“一个护照’,句意是：众所周知，没有护照要周游世界是不可能的。选C。