7．Emergencies（紧急情况）don't happen very often．But when they do，you want to get
help first．No one wants to spend time looking up the phone numbers．
In 1968，the Untied States government wanted one number that people could call for emergencies．They decided that 911was easy to remember and people could dial it quickly．The very first 911call was made on February 16，1968．in Alabama．Today，911is used for emergencies in most parts of the United States and many parts of Canada．
Other countries may use other numbers．In Great Britain，it's 999．If you're not sure which emergency number is used in your area，check your phone book．
When to call
Never call 911as a joke or just to see what might happen．The only time you should call 911is when a person is badly hurt in danger right now!So call when there is a fire，a car accident，or sudden sickness，etc．
When in an emergency call
When you dial the 911operator（接线员），it's always OK to give out your information．Speak slowly and clearly when you explain what's happening．What happened？Where are you？Who needs help？
Don't hang up（挂断）！
If you have to call 911，do not hang up until the operator tells you it's OK to do so，That way，you can be sure that the operator has all the information to offer help fast．
A dog named Faith dialed 911when her owner who was in a wheelchair fell and needed help．She had been taught to use a speed-dial（快速拨号）function．
46．The emergency number 911was first used inB in the USA．
A.1958
B.1968
C.1978
D.1999
47．Why was 911chose to be the emergency call？C
A．Because other countries also used the number．
B．Because it was suggested by the phone company．
C．Because it was simple and easy to remember and dial．
D．Because it was also used in many parts of Canada．
48．People can't call 911whenB．
A．a bus hits a boy badly
B．a girl feels bored
C．an old lady falls off the stairs，unable to stand up
D．some people can't get out of a burning building
49．Which is the right thing to do？A
A．Wait for the operator's words to end the call．
B．Tell the operator what his happened and hang up．
C．Test if your phone can get through to 911．
D．Tell the operator everything as quickly as possible．
50．Which is NOT true according to the passage？D
A.911is an emergency number almost throughout the United States．
B．We haven't got a worldwide universal（通用的）emergency number yet．
C．Usually phone books list emergency call numbers．
D．The dog Faith pressed the three numbers 9-1-1．
分析 这篇短文主要给我们讲述了美国的紧急电话号码911，这个数字比较容易记住，人们在紧急情况时可以快速拨号．作者还讲述了在使用紧急电话的时候应该注意的一些细节．
解答 46-50：BCBAD
46：B 细节理解题．根据短文中第二段The very first 911 call was made on February 16，1968．in Alibama．可知，911这个号码最早是在1968年在阿拉巴马使用的，故应选B．
47．C 细节理解题．根据短文中第二段They decided that 911 was easy to remember and people could dial it quickly．可知，人们决定用911这个数字作为紧急电话号码，是因为它非常容易记住，人们能快速的拨号．故应选C．
48．B 推理判断题．根据文意可知，911是美国的紧急电话，应该在遇到紧急情况的时候使用，A是一辆公共汽车撞倒了一个小孩；B是一个女孩感到非常累；C是一个老太太从楼梯上摔下来，站不起来；D是一些人被困在了着火的大楼里．A、C和D都是紧急情况，故B这种情况不可以拨打这个号码，选B．
49．A 推理判断题．根据倒数第二段If you have to call 911，do not hang up until the operator tells you it's OK to do so可知，在拨打911电话的时候，等接线员告诉你可以挂断电话的时候你再挂断．由此可知选A．
50．D 推理判断题．根据文意可知，911是美国使用的一个紧急电话号码，故A是正确的；根据Other countries may use other numbers可知，美国使用的紧急电话号码是911，但是其他国家可能使用其他号码，因此世界上没有一个通用的紧急电话号码，故B是正确的；根据If you're not sure which emergency number is used in your area，check your phone book．可知C正确．根据She had been taught to use a speed-dial（快递拨号）function．可知，这只小狗使用的是快递拨号功能，故D不对，选D．
点评 本文是一篇日常生活类阅读，题目涉及多道细节理解题，做题时结合原文和题目有针对 性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．
