抛物线y=（x+2）²+1的顶点坐标是（  ）

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    One day an ant was drinking at a small stream and fell in. She made desperate efforts to reach the side, but made no progress at all. The poor ant almost exhausted was still bravely doing her best when a dove saw her. Moved with pity, the bird threw her a blade of grass, which supported her like a raft, and thus the ant reached the bank again. While she was resting and drying herself in the grass, she heard a man come near. He was walking along barefooted with a gun in his hand. As soon as he saw the dove, he wished to kill it. He would certainly have done so, but the ant bit him in the foot just as he raised his gun to fire. He stopped to see what had bit him, and the dove immediately flew away. It was an animal much weaker and smaller than herself that had saved her life.

材料：秦始皇灭六国后，统一了度量衡，官阶和俸禄均以“衡”的单位“石”来表示。到了汉代逐渐将官阶与俸禄分成两种方法表示，官秩（“秩”为官员等级标准，“禄”为官员的报酬）以“石”表示，如万石、二千石等；官俸则用“量”的单位“斛”来计算，如最高秩万石月俸三百五十斛等。在隋唐时期官员俸禄形式主要有米、田两种。隋代官员的俸禄分京官、外官两种支付标准。京官按品级，外官按州、郡、县的等级计户食禄。除俸禄外还有职分田，以品为差，由一顷至五顷不等。至于宋代则因货币的广泛流通，俸禄多以钱币计算。百官除正俸外，还有服装、禄粟、茶酒厨料、薪炭、盐、随从、衣粮、马料、纸笔、差费、职钱、公使钱及恩赏等各种补贴，地方官则配有大量职田。而元代官员俸禄以实物和货币两种形式支付，地方官俸禄中无实物部分，但却享有职田收入，作为俸禄的补贴。到了明代则实行折色俸禄制，即以米为单位折算成钞、钱、布、银发给百官，并以货币为主。而清代官员俸禄是银米兼支，但以银为主。京官有俸银、禄米，外官有养廉银。

——摘编自百度百科