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【简答题】
已知 f(x)=a- 2 3 x +1 (a∈R) ： （1）证明f（x）是R上的增函数； （2）是否存在实数a使函数f（x）为奇函数？若存在，请求出a的值，若不存在，说明理由．
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【简答题】阅读理解。 Do you know that man? He is my uncle. His name is David Smith. He is forty-eight this year. He is a worker. He works in a Car Factory. His factory (工厂) is not near his home. So he gets up early ...
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