8．There is an English saying："Laughter is the best medicine．"Until recently，few people took the saying very seriously．Now however，doctors have begun to study laughter and the effects it has on the human body．They have found facts that laughter really can improve people's health．
Tests were carried out to study the effects of laughter on the body．People watched funny films while doctors checked their heart rate，blood pressure，breathing and muscles．It was found that laughter has similar effects to physical exercise．It increases blood pressure，the heart rate and the rate of breathing； it also works several groups of muscles in the face，the stomach，and even the feet．If laughter exercises the body，it must be beneficial．
Other tests have shown that laughter appears to be able to reducing the effect of pain on the body．In one experiment doctors produce pain on the body．In one experiment doctors produce pain in groups of students who listened to different radio programs．The group which tolerated（忍受） the pain for the longest time was the groups which listened to a funny program．The reason why laughter can reduce pain seems to be that it helps to produce endorphins in the brain．These are natural chemicals which diminish both stress and pain．
There is also some fact to suggest that laughter helps the body's immune system，that is，the system which fights infection．In an experiment，one group of students watched a funny video while another group of students served as the control group----in other words，a group with which to compare the first group．Doctors checked the blood of the students in both groups and found that the people in the group that watch the video had an increase in the activity of their white blood cells，that is，the cells which fight infection．
As a result of these discoveries，some doctors and psychiatrists in the United States now hold laughter clinics，in which they try to improve their patients'condition by encouraging them to laugh．
They have found that even if their patients do not really feel like laughing，making them smile is enough to produce beneficial effects similar to those caused by laughter．
33．It can be learnt from the passage that laughter canC．
A．make people feel younger
B．change people's habits
C．improve peoples health
D．make people love their lives
34．Smiling can produceB．
A．more effects than laughter
B．the same effects as laughter
C．less effects on the human body
D．no effects on the human body
35．The main idea of this passage is thatD．
A．there are several ways of studying the benefits of laughter
B．laughter and physical exercise have the same effects on human body
C．the doctors should learn how to make people laugh
D．tests show that laughter can produce beneficial effects on human body．
分析 這篇文章講的是笑是良藥，而且能減輕病人的痛苦，能夠鍛煉身體并提高人的免疫能力．醫(yī)生現(xiàn)在開(kāi)始研究笑及其對(duì)人身體的作用．
解答 33．C．細(xì)節(jié)理解題．根據(jù)Now however，doctors have begun to study laughter and the effects it has on the human body．They have found facts that laughter really can improve people's health．可知，笑有助于人們的健康．故選C．
34．B．細(xì)節(jié)理解題．根據(jù)文中原句They have found that even if their patients do not really feel like laughing，making them smile is enough to produce good effects similar to those caused by laughter．（他們發(fā)現(xiàn)即使他們的病人確實(shí)不想笑，使他們微笑也能產(chǎn)生和由笑產(chǎn)生的相似的效果．）可知此題選B．
35．D．主旨大意題．根據(jù)全文描述這篇文章主要是說(shuō)明通過(guò)實(shí)驗(yàn)說(shuō)明笑能對(duì)人體產(chǎn)生積極的作用，故選D．
點(diǎn)評(píng) 考查學(xué)生的細(xì)節(jié)理解和推理判斷能力．做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確選擇．在做推理判斷題時(shí)不要以個(gè)人的主觀想象代替文章的事實(shí)，要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷．
