问题补充：
As we all know, it is responsibility as well as honor for a country to be chosen to host the Olympic Games.
A. a, a
B. the, the
C. a, an
D. an, an
答案：
A. a, a
B. the, the
(答案→)C. a, an
D. an, an
解析：考查冠词。本题是抽象名词具体化的考查，responsibility(责任) honor（光荣）都是抽象名词，在本题中都具体化了。第一空用a表示泛指一件负责的事情；第二空仍然用an表示一件光荣的事情。故C正确。
