9．For centuries，the only form of written correspondence（通信）was the letter．Letters were，and are，sent by some form of postal service，the history of which goes back a long way．Indeed，the Egyptians began sending letters from about 2000BC，as did the Chinese a thousand years later．
Of course，modern postal services now are much more developed and faster，depending as they do on cars and planes for delivery．Yet they are still too slow for some people to send urgent documents（紧急文件）and letters．
The invention of the fax（传真）machine increased the speed of delivering documents even more．When you send a fax，you are sending a copy of a piece of correspondence to someone by telephone service．It was not until the early 1980s that such a service was developed enough for businesses to be able to fax documents to each other．
The fax service is still very much in use when copies of documents require to be sent，but，as a way of fast correspondence，it has been largely taken the place of by email，Email is used to describe messages sent form one computer user to another．
There are advantages and disadvantages with emails．If you send someone an email，then he will receive it extremely quickly．Normal postal services are rather slow as far as speed of delivery is concerned．
However，if you write something by email，which you might later regret，and send it immediately，there is no chance for second thoughts．At least，if you are posting a letter you have to address and seal（封）the envelope and take it to the post box．There is plenty of time to change your mind．The message is think before you email!
25．We can learn from the text thatC．
A．the postal service has over the years become slower
B．email is less popular than the fax service
C．the postal service has over the years become faster
D．the fax service has a history as long as the postal service does
26．It can be inferred from the text thatC．
A．the fax machine was invented after the 1980s
B．letters have been used in China for about 1，000years
C．the fax service had been fully developed by the 1980s
D．letters have been used in Egypt for about 2，000years
27．In the last paragraph，the writer mentions"think before you email"to show thatA．
A．you'd better not send your email in a hurry
B．you may regret if you don't seal your envelope
C．you may regret before you send something by email
D．you need plenty of time to send an email
28．The text mainly deals withD．
A．the invention of fax machines
B．the advantage of fax machines
C．the advantage of emails
D．the progress in correspondence．
分析 本文讲述了通讯的发展和由此带来的变化，着重于不同通讯方式的比较和发展过程．
解答 CCAD
25．C 这是一道细节推断题．根据第二段第一句"modern postal services now are much developed and faster"可知现代的邮政服务比以前更发达、更快，故选C．
26．C 这是一道推断题．根据"It was not until the early 1980s that such a service has developed enough …"可以推断20世纪80年代初fax已经比较发达可以满足商用了，所以选C．
27．A 这是一道细节题．由于email方便高速，可供考虑的时间很短，如果发现问题就来不及了，所以作者建议发送前多想想，选A．
28．D 这是一道主旨题．本文讲述了通讯的发展和由此带来的变化，着重于不同通讯方式的比较和发展过程，而不是单单针对某种方式来讲述．D选项最贴近这一点．
点评 阅读这类文章时，也应该在整体把握文章结构的前提下，主要注意细节信息．细节题题干都是相应原文的变形（如同义改写、词性转换等），因此要找到答案一定要找到题干在原文中的出处，再把原文和选项相比较．做题时，根据所提问题用寻读、跳读的方法可达到事半功倍的效果．
