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.

　　28. Laughing too much may cause the following harmful results EXCEPT_________.

　　A. heart stop

　　B. diaphragm movement

　　C. lung burst

　　D. jaw dislocation

　　29. The underlined phrase “doom and gloom” in Paragraph 2 probably means_______.

　　A. hopeless

　　B. funny

　　C. painful

　　D. nervous

　　30. How many calories can you use if you laugh for half a day?

　　A. About 40.

　　B. About 1,000. C. About 2,000.

　　D. About 2,040.

　　31. What is the author’s attitude towards laughing in the last paragraph?

　　A. Uninterested.

　　B. Disapproving.

　　C. Worried.

　　D. Favorable.

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