According to the research，laughing for a quarter of an hour can burn up to 40 calories，and if you laughed all day you’d use up about 2,000 calories，which is what most people consume in a day.But don’t do that or you might end up with a painful jaw.Ouch! Or you might find people looking at you in a funny way.

　　But I don’t want to finish this article leaving you feeling desperate.Laughter comes naturally for most of us.Babies begin to laugh at around 3－6 months.So give in to your sense of humour and keep smiling.Life is short anyway.

　　5．Laughing too much may cause the following harmful results EXCEPT

　　.

　　A．heart stop

　　B．diaphragm movement

　　C．lung burst

　　D．jaw dislocation

　　答案　B

　　解析　细节理解题。根据第一段最后一句“He says，‘We found people with heartbeat problems which had stopped their heart，we found people who had fainted(昏倒)，and we found people who’d dislocated their jaws or burst their lungs.’”可知，危害性有心脏骤停、昏倒、脱臼、伤肺，故选B项。

　　6．The underlined phrase “doom and gloom” in Paragraph 2 probably means “

　　”．

　　A．hopeless

　　B．funny

　　C．painful

　　D．nervous

　　答案　A

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