【正文】 me means going somewhere— to a museum , to a concert , to a restaurant, or to a baseball game , for example. Or it means doing something such as playing volleyball， backpacking， swimming， biking， or playing in a park with their children． For other people free time means staying home with wonderful sources of entertainment， such as a VCR，stereo(立體聲系統(tǒng) )， or cable TV with dozens of channels． Others pursue creative activities such as cooking， gardening， and home improvement． The latest stayathome activity is“ surfing the ” — that is． looking for information and entertainment on the Inter． People in the United States are basically not much different from others in what they do in their leisure time． The real difference may lie in the energy， time， money， and sheer enthusiasm that they devote to it． 21．“ Couch potatoes” in paragraph 1 refers to those who ． A． control their viewing of TV programs B． are happy watching situation edies C． watch TV while eating potato chips D． are crazy about watching TV programs 22 ． According to the passage ， in the eighteenth and nieenth centuries ， some Americans ． A． worked from sunrise to sunset seven days a week B． preferred working in factories to working on farms C． had many of the leisure time activities that people now have D． fought for shorter working hours and more leisure time 23． Apart from technology， the growing leisure time throughout the twentieth century is also due to ． A． changes in laws B． mass entertainment C． new types of consumption D． petitive businesses 24． In terms of leisure time activities， people in the United States ． A． enjoy a larger variety than people in other countries B． are not much different from people in other countries C． enjoy more stay— at— home activities such as“ surfing the ’’ D． are less energetic and enthusiastic than others Passage Two Whether you are logging on to your personal puter， using a credit card， or disarming a door security system， passwords or PINs(personal identification numbers)jealously guard access to numerous regular operations． It is estimated that within ten years， consumers could be faced with handling more than 100 passwords! Given the popularity of passwords， how Can you choose ones that are sufficiently plicated to be secure yet are simple enough to remember? There are basic guidelines to bear in mind． First， the don‘ts． Don‘t use as a password your name or that of a member of your family， even in modified form． Also avoid use of your telephone number， your Social Security number， or your address． Such information Can easily be obtained by a determined hacker(黑客 )． In addition， if possible， don‘t use passwords made up entirely of letters or digits． A relatively simple puter program can crack such a code quickly． Finally， do not use a word that can be found in any dictionary， even a foreignlanguage one． Huge lists are available that contain words， place names， and proper names from all languages． Programs can test for variations of these words， such as if they are spelled backward， capitalized， or bined． So， what kinds of passwords should be used? Usually ones that have a minimum of six to eight characters and that have a mixture of upper— and lowercase letters， digits， and punctuation(標(biāo)點(diǎn) )symbols． How difficult is it to crack such a bination of characters? One source says that“ a machine that could try one million passwords per second would require， on the average， over one hundred years．” How can you choose a bination that is easy to remember? Some suggest that you take the title of a favorite book or film or a line from a song or poem and use the first letter from each word as your password， adding capital letters， punctuation， or other characters． For example，“ to be or not to be” could bee“ 2B／ not2B”． Other suggestions include taking two short words and link them with a punctuation character． such as“ High。 ?Bug ” or“ Song； Tree”． Taking into account the suggestions outlined above can help you to protect important information from unwanted hackers． Remember， too， the importance of changing your passwords regularly． Just a final ment： Whatever passwords you decide to use， don‘t pick any of the examples given above． 25． What is the main idea of this passage? A． How to strengthen security through a password． B． How to choose a password that is easy to remember． C． How to prevent your password from being cracked． D． How to choose a safe and convenient password． 26． Why shouldn‘t we use a word that can be found in any dictionary as a password? A． Because it can be easily remembered by a puter hacker． B． Because puter programs can crack it． C． Because puter hackers are determined to crack it． D． Because the lists are so huge that the words are not easy to remember． 27． If you are choosing a password for your puter． which of the following is the best choice? A． iaHgnahs B． I 9730508 C． 2B／ not2B D． ReB,p12 28． How can you choose a password that is both secure and simple to remember? A． Taking the title of your favorite book or film． B． Taking a line from a song or poem you like best． C． Making up a nonsensical word which cannot be found in any dictionary． D． Using two short words linked with a punctuation character． Passage Three According to a concerned 1 997 article in the Boston Globe， the United States spent less than one percent of its transportation budget on facilities for pedestrians(行人 )． Actually， I‘m surprised it was that much． Go to almost any suburb developed in the last 30 years， and you will not find a sidewalk anywhere． Often you won‘t find a single pedestrian crossing． I was made fully aware of this one summer when we were driving across Maine and stopped fo