单项选择题 What relation is the woman to Mr. Cooper? A His wifeB His boss． C His secretary．

单项选择题 We learn from the text that a person with heart disease has a better chance of getting well if A．he has a pet companion B．he has less stress of workC．he often does mental arithmetic D．he is taken care of by his family

单项选择题 According to Allen, why did the people do better with pets around when l~cing stressful tasks? A．They have lower blood pressure. B．They become more patient.C．They are less nervous. D．They are in higher spirits.