问题
选择题
Global warming leads _________the melting of ice caps. [ ]
A. on
B. in
C. at
D. to
答案
答案：D
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Global warming leads _________the melting of ice caps. [ ]
A. on
B. in
C. at
D. to
答案：D
（其中c1、c2是任意常数）是微分方程
的（）。