题目

You know the saying You're as young as you feel. Well, there may be some truth t, according to that, according to researchers at Harvard and the Massachusetts Institute of Technology. Ellen Langer, a Harvard psychologist who studies how the mind influences the body, and colleagues reviewed the scientific literature for evidence that a person’s perception of their age might influence their health. They published their results in the journal Perspectives on Psychological Science. In one study that Langer led, 47 women had their hair done. The women who thought their new hairdos made th一直角三角形的三边分别为2,3,x,那么以x为边长的正方形的面积为( )A. 13 B. 5 C. 4 D. 13或5