题目

Last week, Rahman's wife had an accident. Rahman's youngest child, Yusof. was at home when it happened. He was playing with his new toy car. Rahman had given it to him the week before for his third birthday.     Suddenly Yusof heard his mother calling Help! Help? He ran to the kitchen, His mother had burned herself with some hot cooking oil. She was crying with pain and the frying-pan was on fire.     Rahman had gone to his office. Both the other children had gone to school. Yusof was too small to help his mother, and she was too terrified to speak sensibly to him. But he ran to 已知定义在R上的奇函数和偶函数满足 ，若，则（   ） A.          B.         C.         D.