1．While most people consider that laughter is one of the nature's great treatments for a whole range of mental and physical diseases，it is still a serious scientific subject that researchers are trying to figure out．
"Laughter is social．"says Robert R．Provine，author of the book"Laughter：A Scientific Investigation"，who has been studying laughter for decades．"Almost all people laugh‘ha-ha-ha'basically the same way．Whether you speak Mandarin，F(xiàn)rench or English，everyone will understand laughter．There is a pattern generator（發(fā)生器） in our brain that produces this sound．
Laughing is also a good way of communicating．Babies laugh long before they speak．No one teaches them how to laugh．They just do it．People may laugh at a prank（惡作�。� on April Fools'day．But surprisingly，only 10to 15percent of laughter is the result of someone making a joke．Laughter is mostly about social responses rather than reaction to a joke．Deaf people laugh without hearing and people on cell phones laugh without seeing，which shows that laughter isn't dependent on a single sense but on social interactions．
And laughter is not just a human thing．Chimps tickle（撓癢） each other and even laugh when another chimp pretends to tickle them．
Jaak Panksepp studies rats that laugh when he tickles them．It turns out rats love to be tickled．They return again and again to the hands of researchers tickling them，Panksepp's video shows．
By studying rats，scientists can figure out what's going on in the brain during laughter．It has been found that laughter in rats produces a chemical that acts as an antidepressant（抗抑郁藥） and anxiety-reducer．Scientists think the same thing probably happens in humans，too．This would give doctors a new chemical target in the brain in their effort to develop drugs that fight depression and anxiety in people．
Even so，laughter itself has not been proved to be the best medicine，experts said．"No study has shown that laughter produces a direct health benefit，"Provine said，"largely because it's hard to separate laughter from just feeling good．"
64．Why does the writer say"laughter is mostly about social responses rather than reaction to a joke"？A
A．because people can communicate with each other by laughing．
B．because laughter is the same sound in all the human's languages．
C．because laughter is considered a basic language all people can learn．
D．because everyone can understand the meaning of the word laughter．
65．From the last two paragraphs we know thatC．
A．laughter has no direct connection with good feelings
B．laughing every day can cure people of many diseases
C．the medical functions of laughter are still under experiment
D．scientists have learned what is happening in a human brain when he laughs
66．Which of the following statements is true according to the passage？B
A．Laughter depends on many senses．
B．Laughter is a social response shared by all creatures．
C．If you speak different languages，you will laugh differently．
D．A new medicine has been developed based on the laughter research．
分析 本文是一篇科教類閱讀，文章主要介紹了一項對笑的新研究，和以往人們的觀點不同的是，研究人員發(fā)現(xiàn)笑是人類社會化的反應(yīng)，而且動物也有相同的情況．所有人都知道微笑對我們的身體及精神都有很大的幫助作用，但事實上我們并不清楚對我們有好處的原因．笑從本質(zhì)上來說是社會性的東西，不只是在人類中才有，動物中也有．因此，科學(xué)家研究老鼠是為了看在老鼠笑時會產(chǎn)生什么，通過研究發(fā)現(xiàn)大笑時會產(chǎn)生一種化學(xué)物質(zhì)，其作用相當(dāng)于抗抑郁藥．
解答 64-66．ACB
64．A理解判斷題．根據(jù)第三段Laughing is also a good way of communicating．和which shows that laughter isn't dependent on a single sense but on social interactions．可知笑是一種很好的交流方式，笑不依賴于單一感測，而是社會上的相互作用．由此可知，作者說"大笑"主要是社會反應(yīng)，而不是對玩笑的反應(yīng)，這是因為人們總是可以笑著互相交流．故選A．
65．C細節(jié)理解題．根據(jù)最后一段Even so，laughter itself has not been proved to be the best medicine，可知"笑"還沒有被證明是一種很好的藥．即笑聲的醫(yī)療功能仍在實驗．故選C．
66．B理解判斷題．根據(jù)第四段And laughter is not just a human thing．Chimps tickle（撓癢） each other and even laugh when another chimp pretends to tickle them．可知笑不僅僅是人類的反應(yīng)，猩猩互相撓癢也會笑．此外老鼠也會笑．由此可知，笑是一種所有的生物都有的社交反應(yīng)．故選B．
點評 本文考察學(xué)生的理解推斷能力，抓住文章的關(guān)鍵詞，采用尋讀的方法查找細節(jié)，能根據(jù)已知的結(jié)果推測導(dǎo)致結(jié)果的可能原因．
