问题
选择题
He's very sad, I'd like to . [ ]
A. cheer up him
B. think him up
C. cheer him up
答案
答案：C
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He's very sad, I'd like to . [ ]
A. cheer up him
B. think him up
C. cheer him up
答案：C
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，则保持水的化学性质的粒子可表示为 [ ]
