阅读 The reasons why we laugh may be products of evolution．Most agree that we laugh when we find something to be humorous, but different reasons exist for what we find to be humorous．Additionally, di 题目和参考答案——青夏教育精英家教网—

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　　The reasons why we laugh may be products of evolution(进化)．Most agree that we laugh when we find something to be humorous, but different reasons exist for what we find to be humorous．Additionally, different things are humorous to us at different stages of life．

　　Laughter, a physiological response to humor, can be broken down into two parts．

　　The first is a set of gestures, and the second is the production of sound．The brain conducts both responses at the same time．

　　Strangely enough, laughter is an orderly response, and almost occurs “spontaneously(本能地)” during pauses at the end of phrases．Human beings are the only species capable of laughter, and one average adult does so approximately(近似地)17 times per day．

　　Good health is one of the many benefits of laughter．Laughter reduces our stress levels by reducing the level of stress hormones(荷尔蒙), and also helps us cope with serious illnesses．

　　Physiologically, laughter promotes healing by lowering the blood pressure, by increasing the vascular blood flow and the oxygenation of the blood．

　　Physical fitness stemming from laughter is a benefit known to few．Scientists estimate that laughing 100 times is equivalent to a 10-minute workout on a rowing machine, or to 15 minutes on a stationary exercise bike．

　　Another benefit of laughter is that it improves our over-all mental health．Pent up(被压抑的)negative emotions, such as anger, fear, and sadness, can cause biochemical changes in our bodies that can produce a harmful effect．

　　Laughter provides a harmless outlet(出口)for these negative emotions, and provides a coping mechanism for dealing with difficult or stressful situations．

(1)

What is the best title of the passage?
[　　]
A．	Why do we laugh?
B．	An harmless outlet．
C．	Benefits of laughter．
D．	A physiological response to humor．

(2)

Which of the following isn’t one of the benefits of laughter?
[　　]
A．	The lowering of the blood pressure．
B．	The increasing of the vascular blood flow．
C．	Producing a harmful effect．
D．	Good health．

答案：1．A;2．C;

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