题目：
In his first speech as victor, Obama said, “There are many who won’t agree with every decision or policy I make as ________ president, and we know that government can’t solve every problem. But I will always be honest with you about ________ challenges we face.”
A．a; /
B．the; the
C．/; the
D．the; /
答案：
答案：C
考察冠词用法。上文作为一个总统这里是泛指用不定冠词。下文特指我们面临的挑战，故用不定冠词，选C。
