题目

Mr Wang didn’t come , so Mrs. Wang ______ .A. took him place B. took his placeC. took of him D. became him 答案：【答案】B【解析】试题句意：王先生不来了，因此王夫人代替他。Take one’s place：代替某人做某事。故选B。已知f（x）是定义域为R的奇函数，且当x＞0时，f（x）=x3+x+1时（1）求f（2），f（-2）； （2）求f（0）；（3）求f（x）在R上的解析式．