According to the given information, the 2nd heaviest dog is 28kg, so the sum of the remaining 3 dogs is: 60 - 28 = 32kg. So the heaviest one has at least 29kg, and the sum of the weight of the 2 remaining dogs is 3kg. Since none of them weigh the same, the weight of the 2 remaining dogs is 2kg and 1kg respectively. Choose A.  本题中，第二重的狗体重为$$28$$千克，剩余$$3$$只狗的体重和为：$$60-28=32$$（千克）．此时最重的狗体重至少为$$29$$千克，那么剩下的两只狗体重之和至多只有$$3$$千克，则它们的体重只能是$$1$$千克和$$2$$千克．因此第三重的狗体重为$$2$$千克．选$$\text{A}$$． 
丽丽有 4 只狗，每只狗的体重都是整数 kg，且重量各不相同．已知它们的总重量为 60kg，第二重的狗有 28kg．请问第三重的狗体重是？ 
Options:
[1] $$2kg$$ 
[2] $$3kg$$ 
[3] $$4kg$$ 
[4] $$5kg$$ 
[5] $$6kg$$ 