题目

A handsome man can earn a fifth more than an average-looking colleague but a beautiful woman is not paid a penny more than her average-looking colleague, new research has shown. The study by senior economists（经济学家）found that being good-looking meant male workers could earn 22 percent more than average-looking colleagues. Researchers said good looks did not give women a similar advantage. Andrew Leigh, a former economics professor at the Australian National University who co-authored the report, said: “Beauty can be a double-edged sword for women.” “Some people still b下列各项中，与其它三项不同的是（　　）A．铃声响狗分泌唾液B．猴子打篮球C．鹦鹉对客人说“你好”D．鸟类的迁徙