根据短文内容，从短文前方框内的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。
Have you ever counted the number of digits(数字) in your mobile phone number? Your number has 11 digits. You may sometimes find it hard to remember your number.129．Why is that?
The 11 digits can be divided into three parts.130．The first three numbers tell you which mobile phone service provider you are using. For example, 135 is for the China Mobile Communication Corporation and 188 is for China Unicom. The fourth to the seventh digits tell you which area the number is recorded in. And the last four digits are random (随机的).
131．We once had 10 numbers. But as our population grew, there were not enough numbers for us to use. So we began to use 11 digits starting from 1999.
Eleven digits can be used to make tens of billions of mobile phone numbers, according to the Xinhua News Agency. That’s enough for each person to have seven or eight phone numbers to use in China.132．Usually, the service provider will reuse a canceled number after three to six months. If you call a number that you haven’t contacted (联络) for a long time, you may find that its owner has changed.
Besides China, Britain and Japan also use 11-digit mobile phone numbers. But their numbers always start with 0.133．Countries like the United States, Australia and India use phone numbers with l0 digits. Canada’s mobile phone numbers are perhaps the world’s shortest: they use seven digits.
A．Each part has a different meaning.
B．So they cannot create as many numbers as we can.
C．That’s because China has the longest mobile phone numbers in the world.
D．Also, mobile phone numbers can be recycled.
E.The main reason for using 11 digits is that we have the largest population in the world.
 
试题分析：本文介绍了熟记电话号码的步骤，同时也简单介绍了不同国家使用移动号码的差异。
129．C【解析】根据Your number has 11 digits. You may sometimes find it hard to remember your number.，难记住你的11位电话号码。可知备选句子That’s because China has the longest mobile phone numbers in the world.解释了原因，故选C。
130．A【解析】根据The 11 digits can be divided into three parts.以及下文对移动和联通的举例，可知备选句子Each part has a different meaning.符合题意，故选A。
131．E【解析】根据下文We once had 10 numbers. But as our population grew, there were not enough numbers for us to use. So we began to use 11 digits starting from 1999.，解释了增加数位的原因，备选句子The main reason for using 11 digits is that we have the largest population in the world.符合题意，故选E。
132．D【解析】根据Usually, the service provider will reuse a canceled number after three to six months.运营商将在三到六个月后重用被取消的号码，可知谈的是号码回收问题。备选句子中，Also, mobile phone numbers can be recycled.符合题意，故选D。
133．B【解析】根据Countries like the United States, Australia and India use phone numbers with l0 digits.例举的都是不到10位的电话号码，可知备选句子So they cannot create as many numbers as we can.符合题意，故选B。
点睛：完成短文，要求根据上下文选用合适的句子填空，使句意通顺、前后连贯。重在考查学生对所学语言的综合运用能力和对文段的理解判断能力。本题难度不大，只要把握好上下句的意思和关系，正确作答是不成问题的。