Question

【题目】 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. 【1】 Why is that?

The 11 digits can be divided into three parts. 【2】 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). 【3】. 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 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 in China. 【4】 Usually, the service provider will reuse a canceled(取消的) 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. 【5】 Countries like the United States, Australia and India use phone numbers with 10 digits. Canada’s mobile phone numbers are perhaps the world’s shortest: they use seven digits.

根据材料内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺。

A.Each part has a different meaning.

B.So they can't 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.

Answer 1

【答案】

【1】C

【2】A

【3】E

【4】D

【5】B

【解析】

本文是一篇说明文，主要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。

【1】句意：那是因为中国拥有世界上最长的手机号码。

根据“Your number has 11 digits. You may sometimes find it hard to remember your number.”你的号码有11位数字。有时你会发现很难记住自己的电话号码。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。

【2】句意：每个部分都有不同的含义。

根据“The 11 digits can be divided into three parts.”11位数字可以分成三部分。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。

【3】句意：使用11位数的主要原因是我们拥有世界上最多的人口。

根据“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 from 1999.”我们曾经用10位数字。但是随着人口的增长，没有足够的数量供我们使用。所以我们从1999年开始使用11位数字。解释了增加数位的原因，故备选句子The main reason for using 11 digits is that we have the largest population in the world. 符合题意，E。

【4】句意：此外，手机号码也可以回收利用。

根据“Usually, the service provider will reuse a canceled(取消的) number after three to six months.”通常，服务商会在三到六个月之后再次使用一个被取消的号码。可知讨论的是号码回收问题。备选句子中Also, mobile phone numbers can be recycled.符合题意，故选D。

【5】句意：所以他们不能创造出像我们一样多的数字。

根据“Countries like the United States, Australia and India use phone numbers with 10 digits.”美国、澳大利亚和印度等国家使用10位数的电话号码。可知举例的都是不到11位的电话号码。可知备选句子So they can't create as many numbers as we can.符合题意，故选B。