题目

根据短文内容及所给提示，在文中的横线上填写一个正确的单词。At the age of fifteen, I met【1】 Australian teacher. He taught us English. One day, he wrote an English poem 【2】the blackboard and asked us the meaning. There was a long silence. Unluckily, the teacher 【3】(choose) me to answer the questions. I said in a low v【4】, “Sorry, I don’t know.” That’s always my r【5】to difficult questions. He said, “You should at 【6】(little) have some ideas about the questions, no matter how difficult it is. It doesn’t mean that you don’t know. It （文） 已知f（x）是定义在R上的函数，且对任意x∈R，都有f（x+3）≤f（x）+3和f（x+2）≥f（x）+2，若f（998）=1002，则f（2012）=    ．