问题补充：
wide spread of H1N1 is challenge for the whole world. Confidence, cooperation and responsibility are keys to overcoming it.
A. A; the
B. A; a
C. The; the
D. The; a
答案：
A. A; the
B. A; a
C. The; the
(答案→)D. The; a
解析：可联系答.案.网客服索取。
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