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P刀第一节阅读理解（共两节，满分40分）》(共15小题：每小题2分，满分30分)阅读下面短文，从每题所给的AB,C和D四个选项中，选出最佳选项
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分析f（x）的对称轴为x=0，由f（x）的定义域，值域即可得到-2≤a≤0．
解答解：∵函数f（x）=x2的图象是开口朝上，且以x=0为对称轴的抛物线，
当且仅当x=0时，函数取最小值0，
又由f（x）=x2=4时，x=±2，
故函数f（x）=x2定义域是[a，2]，值域是[0，4]时，-2≤a≤0
故答案为：-2≤a≤0
点评本题考查的知识点是二次函数的图象和性质，熟练掌握二次函数的图象和性质，是解答的关键．
