36 We learn from the first paragraph that laughter
A is good for one's health.
B is related to some illness.
C has been investigated long since.
D has no effect on the body.
37 Doctors have found that laughter
A keeps down blood pressure.
B has similar effects to physical exercise.
C decreases the heart rate.
D increases stress.
38 Which of the following statements is NOT true of laughter， according to the passage?
A It reduces pain
B It exercises the body.
C it improves the body's immune system.
D It can cure cancer.
39 In a laughter clinic doctors
A laugh at their patients.
B encourage their patients to laugh.
C smile when they don't feel like laughing.
D never stop laughing.
40 The writer's attitude towards laughter is
A critical.
B doubtful
C positive.
D negative.
参考答案：
36. A 37. B 38. D 39. B 40. C
