题目

已知函数f（x）=x2+cosx，f′（x）是函数f（x）的导函数，则f′（x）的图象大致是（ ） A． B． C  D． 答案：A 用所给动词的适当形式填空 The boy was naughty but he always avoided ________(catch)so the teacher thought I was good．