问题补充：
He witnessed Yushu, a county in Qinghai Province hit by unexpected earthquake, but the Yushu people haven’t lost heart, vowing to turn their homeland into more beautiful Yushu.
A. a; a
B. an; the
C. the; a
D. an; a
答案：
A. a; a
B. an; the
C. the; a
(答案→)D. an; a
解析：考查冠词用法，句意为他目击了玉树（青海省的一个县）被一次意料之外的地震袭击，但是玉树人民没有失去信心，发誓要把他们的家园变成一个更加漂亮的玉树。
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