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Even after centuries of 【小题1】(science) research, no one knows for sure why human beings laugh.
Charles Darwin guessed that laughter, 【小题2】 begins in infants as young as three months old, served as a"reward"to parental care-giving. Laughter of infants sounded and felt so different from crying, and he believed that even prehistoric(史前的) parents must have regarded it 【小题3】 a sign of well-being. The parents enjoyed the laughter, which encouraged them 【小题4】(continue) caring for the child.
One of the most interesting things researchers have learned is the powerful healing effect of laughter. Well,actually they're re-learning it after centuries of neglect:in the Middle Ages, doctors "treated" their 【小题5】(patient) by telling them jokes.
Scientists 【小题6】(learn) a lot about laughter so far.You use 15 different muscles in your face to laugh. The sound of laughter is created when you breathe in deeply 【小题7】 then breathe out the air. The typical laugh is made up of pulses(节奏)of sound that are about 1/15th of a second long and 1/5th of a second apart.When tape-recorded and 【小题8】(play) backward,laughing sounds 【小题9】(virtual) the same as it does when it is played forward. 【小题10】 was also found that the most laughter took place when males were talking and females were listening, and the least took place when females were talking and males were listening.
Even after centuries of 【小题1】(science) research, no one knows for sure why human beings laugh.
Charles Darwin guessed that laughter, 【小题2】 begins in infants as young as three months old, served as a"reward"to parental care-giving. Laughter of infants sounded and felt so different from crying, and he believed that even prehistoric(史前的) parents must have regarded it 【小题3】 a sign of well-being. The parents enjoyed the laughter, which encouraged them 【小题4】(continue) caring for the child.
One of the most interesting things researchers have learned is the powerful healing effect of laughter. Well,actually they're re-learning it after centuries of neglect:in the Middle Ages, doctors "treated" their 【小题5】(patient) by telling them jokes.
Scientists 【小题6】(learn) a lot about laughter so far.You use 15 different muscles in your face to laugh. The sound of laughter is created when you breathe in deeply 【小题7】 then breathe out the air. The typical laugh is made up of pulses(节奏)of sound that are about 1/15th of a second long and 1/5th of a second apart.When tape-recorded and 【小题8】(play) backward,laughing sounds 【小题9】(virtual) the same as it does when it is played forward. 【小题10】 was also found that the most laughter took place when males were talking and females were listening, and the least took place when females were talking and males were listening.
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