Today is Sunday. My family likes to have fun together. In the morning, we plant potatoes on the farm. Then we go to the zoo to watch the animals. In the afternoon, we fly kites together. And in the evening, we go to the cinema to watch a film. At 8：00 pm, we watch TV at home.

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夏日的微风，带着大自然炽热的生命气息．经过两年的生物学学习，“人与自然和谐发展”的理念已根植你的心底．下列叙述不符合这一理念的是（   ）

如图，AD是△ABC的角平分线，DE，DF分别是△ABD和△ACD的高，得到下列四个结论：

①OA=OD；   ②AD⊥EF；  ③当∠A=90°时，四边形AEDF是正方形；   ④AE+DF=AF+DE．  其中正确的是（　　）

方程组$\left\{\begin{array}{c}x-y=0\\ x+y=2\end{array}\right.$的解为（　　）