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【单选题】
下列结沦中，错误的有（ ） ①Rt△ABC中，已知两边分别为3和4，则第三边的长为5； ②三角形的三边分别为a、b、c，若a 2 +b 2 =c 2 ，则∠A=90°； ③若△ABC中，∠A：∠B：∠C=1：5：6，则这个三角形是一个直角三角形； ④若（x-y） 2 +M=（x+y） 2 成立，则M=4xy．A.
0个
B.
1个
C.
2个
D.
3个
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