题目

Peter is thirteen. He is   1  Grade Two this year. He likes to play football and watch football matches. And he often   2  newspapers. He does his best to know where and when a football match will be. Now Peter is having lunch. He is   3  the radio, too.  He is very happy   4  there will be a nice football match on TV at four   5  this afternoon. He wants   6  it very much. But he is going to have English and Chinese lessons. It’s   7  for him to find a way.“Hello, Mrs. Black,” Peter says to his teacher   8  the phone. “Peter is ill in bed. He wants to 设函数f（x）=x2-2x+2，x∈[t，t+1]（t∈R）的最小值为g（t），求g（t）的表达式．