主观题：统计文件中字符串的出现频次 （高教社，《Python编程基础及应用》习题11-5）



文件11-5.txt的内容如下：

China's regulator has proposed phasing out domestic cryptocurrency mining
in a document published on Friday, stepping up efforts to rein in the sector.
The National Development and Reform Commission (NDRC) added the sector to
the 2021 negative list on Friday and is asking for public feedback.
The draft 2021 negative list covers 117 industries, six less than the 2020
list, according to the NDRC. Investing in sectors on the list is either
banned or requires permits.
Citing concerns including energy-wasting and regulation, officials included
cryptocurrency mining on an April 2019 preliminary list of industries China
wanted to eliminate. However, it was removed from the final version of the
list published in November 2019.
The crypto market has drawn regulatory attention, as the highly volatile
digital currencies pose growing risks.
China in September banned cryptocurrency transactions and prohibited
opening new mining projects in the country. It had also barred financial
institutions and payment companies from providing services related to
cryptocurrency transactions in May.



请完成上述程序，并上传一张jpg格式文件：<br>
1.包括代码；<br>
2.显示程序的执行结果，统计的字符串内容自选。






答案：NA