2．选B　细节理解题。根据文章第二段第一句“They are usually organized with the help of the Internet or other digital communications networks.”和第二段最后一句“Using mobile phones ...”可知，答案B符合文意。

　　3．选C　细节理解题。根据文章第三段最后一句“Wasik claimed that he created the flash mob as a social experiment designed to laugh at fashion seekers ...”可知，答案C符合文意。

　　4．选B　推理判断题。根据文章最后一段最后一句“Flash mobs give people from all walks of life an opportunity to come together to create a memory.”可推知：人们由此被鼓励积极参与活动，故答案B符合文意。

　　.参考范文：

　　Last year, on 11 November, the sales of T­mall reached 35 billion yuan, which equals the total sales of all the Wangfujing Department stores for a whole year. It shows that the way people buy and sell things is changing and online shopping is becoming increasingly popular.

　　The reasons why people are crazy shopping online are as follows. For one thing, people can buy whatever they want at a much lower price online and all this can be done by just a click on the mouse. For another, it has become a trend for people to buy things on this special day, so you may find yourself out of date if you don't do the same.

　　In my opinion, while online shopping offers us a lower price and a wider variety, we should always buy things we really want and avoid wasting money.

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