题目

Malka and Shaindle are sisters. Although they live an hour's drive from each other and don’t see each other often, they are in touch. Malka has a large family. Shaindle, however, has had difficulty having children. Malka had just given birth to another son. Shaindle , married three years and still childless, was receiving fertility(生育) treatments. Involved with work, doctor’s visits, and medical treats, she was unable to make the trip to visit her sister after she had given birth. Malka knew her sister’s problem and was quite understanding. Shaindle and her husband Feivel wo 已知函数y＝f(x)的图像与函数y＝2－x－1的图像关于直线y＝x对称，则f(3)的值为 [　　] A．1 B．－1 C．2 D．－2