题目

Larissa and Melanie Watson are sisters. They are also twins. They are nineteen years old, and they live in Auckland, New Zealand. Larissa and Melanie are magicians. They come from a family of magicians. Their father is a magician. His name is Alan. Their mother, Michele, is a magician, too. They have an older sister. Her name is Nicole, and she is also a magician. Their great-great-uncle, Oswald Ashton, was a magician. In 1920, he helped start the New Zealand Society of Magicians. Larissa and Melanie are famous all over the world. They have been on television many times. They do many kin已知f(x)是奇函数,g(x)是偶函数,且f(-1)+g(1)=2,f(1)+g(-1)=4,则g(1)等于(　　)A．4B．3C．2D．1