题目内容
4．Knuckle-popping（指关节砰砰响）Do you slurp（咕噜）soup？Do you pop bubble gum？If you do，your habits won't help you win friends-but they're fun．But how about knuckle-popping？Not you does this hobby give people around you the"willies（[俚]神经紧张），"but cracking knuckles can lead to monster knuckles（异乎寻常的响声），and maybe-to arthritis （关节炎）．
At least，most people think knuckle-popping is bad．Well，there's no doubt that the people who have to listen to knuckles being snapped（啪地一声折断）can't stand the sound．But how bad is it for the knuckle-popper？
A doctor has looked into this indoor sport．He says it's not harmful．Dr．Robert L．Swezey found that his son was cracking his knuckles．And the kid's grandmother thought it was terrible．So Dr．Swezey went to a home for the aged．He studied the knuckles of old people there．Only one out of fifteen old people who said they cracked their knuckles all their lives had something wrong with their finger joints．Also，five out of twelve women who never cracked their knuckles had trouble with their joints．So if you want to go on popping your knuckles，Dr．Swezey says if OK，even if his son's grandma still doesn't like it．
28．People who hear others cracking their knucklesA．
A．are bothered．
B．don't notice the sound
C．start to crack their own knuckles．
D．feel it's as had as slurping soup．
29．When Dr．Swezey went to the old-age-home，what did he find out about old people who had cracked their knuckles？C
A．Only one old people had something wrong with their finger joins．
B．Only old women had cracked their knuckles．
C．About 6.7percent of the old people had something wrong with their finger joints．
D．The old people were all well．
30．Which of the following is right？D
A．Slurping soup and popping bubble gum are food habits．
B．Cracking knuckles will lead to arthritis．
C．No one likes cracking his knuckles．
D．Some women who didn't crack their knuckles had something wrong with their finger joints．
31．If you pop your knuckles，Dr．Swezey thinks you might as wellA．
A．go on doing it．
B．stop at once．
C．avoid people who do it．
D．not do it around your friends．
分析 本文为科教类说明文，文中分析了扳指关节的习惯的影响；一个在喝汤时或做其它事件时总是发出呼噜声的人不容易赢得朋友，那么总是扳指关节的人呢？毫无疑问，人们听到指关节啪地一声折断的声音忍受不了这个声音，甚至总是扳指关节的人会得关节炎；然而Swezey医生通过调查发现这个习惯于关节炎毫无关系，所以，如果你想继续扳指关节，没关系，继续吧．
解答 28．答案是A．细节理解题；根据第二段中的"there's no doubt that the people who have to listen to knuckles being snapped（啪地一声折断）can't stand the sound（毫无疑问，人们听到指关节啪地一声折断的声音忍受不了这个声音）"判断这个声音让人感到烦恼，故选A．
29．答案是C．细节理解题；由第三段中的"Only one out of fifteen old people who said they cracked their knuckles all their lives had something wrong with their finger joints．"可知，那些一生都有扳指关节习惯的老人中，每15人中有一人，即6.7%的老人有关节问题；故选C．
30．答案是D． 细节理解题；由第三段中的"five out of twelve women who never cracked their knuckles had trouble with their joints．"可知，那些从不扳指关节的妇女中，每12名妇女中有五人有关节问题，故选D．
31．答案是A．细节理解题；由最后一段中"So if you want to go on popping your knuckles，Dr．Swezey says it OK"可知，Swezey医生认为，如果你想继续扳指关节，没关系，故选A．
点评 阅读要在整体理解文章的基础上，在做细节题时根据题干定位细节，在语境中正确理解原句，然后对照选项做出合理的判断；必要的时候要进行推理，透过句子表面看作者的真正意图．
