If you see a group of people dancing and singing on the street or in the railway station,? you don't need to feel surprised．They are a flash mob （快闪族）, which is a group of people who come together suddenly in a public place, do something unusual for a brief period of time, and then quickly break up．They are usually organized with the help of the Internet or other digital communication network．At a predetermined time, they gather and perform some? distractions（消遣） such as waving their hands and exchanging books, Then, they quickly break up before the police can arrive．Using mobile phones, the flash mob can change its location if the first one has been replaced for any reason．

??????? Bill Lasik, senior editor of Harper’s Magazine, organized the first flash mob in Manhattan in May 2003 and the first successful flash mob came together on June 3, 2003 - after the first attempt was foiled at Macy's department store．Lasik claimed that the activity was designed to make fun of hipsters （起时髦的人）, and call attention to the cultural atmosphere．???????

????? Flash mob gatherings can sometimes shock people．Such an activity might seem amusing and untrue, but it also might frighten people who are not aware of what is taking place．Undoubtedly, flash mobs can serve as good political tools in any direction．They also have great economic potential, such as using flash mobs to advertise a product．

????? The flash mob is now becoming more and more popular．People use it to do many things．For example, in 2009, Michael Jackson's fans took part in a flash mob to remember him．Hundreds of his fans gathered singing and dancing Michael's famous song "Beat It" together．Flash mobs give people from all walks of life an opportunity to come together to create a memory．

1.The undefined word "foiled" in Paragraph 2 can be replaced by _????? 。

A．forgotten????????? B．prevented???? C．announced??????? D．confirmed

2.What can you learn about the flash mob from the passage?

A．The flash mob usually breaks up quickly for lacking enough time．

B．Once the place for the activity is determined, it can't be changed．

C．The flash mob can be made use offing many fields just for fun．

D．It gives people the chance to come together to do something unusual．

3.The main purpose of the passage is -

A．to entertain?????????? B．to encourage????

C．to inform????????? D．to persuade

4.The writer's attitude towards the flash mob is

A．negative????????????? C．favorable??? ????????????? B．objective??? ????????????? D．doubtful

在生活中，你或者你的朋友都有可能遭遇过这样的尴尬：年长的人不能理解或误解你们这一辈比较流行的文化现象，比如说：“快闪（flash mob）”。请你就此“generation gap”的现象由此展开想像或结合你的实际经历以第一人称写一篇英语短文。内容应包括：1. 你的这次被误解的具体经历；2、你当时的心情； 3、你如何向长辈解释清楚你的“古怪”行为。

注意：1、词数不少于120；

      2、不能使用真实姓名和学校名称。

        3、“快闪”只是提供一个例子，你可以自由地选取任何“流行文化现象”进行描述

在生活中，你或者你的朋友都有可能遭遇过这样的尴尬：年长的人不能理解或误解你们这一辈比较流行的文化现象，比如说：“快闪（flash mob）”。请你就此“generation gap”的现象由此展开想像或结合你的实际经历以第一人称写一篇英语短文。内容应包括：1. 你的这次被误解的具体经历；2、你当时的心情； 3、你如何向长辈解释清楚你的“古怪”行为。

注意：1、词数不少于120；

      2、不能使用真实姓名和学校名称。

      3、“快闪”只是提供一个例子，你可以自由地选取任何“流行文化现象”进行描述

在生活中，你或者你的朋友都有可能遭遇过这样的尴尬：年长的人不能理解或误解你们这一辈比较流行的文化现象，比如说：“快闪（flash mob）”。请你就此“generation gap”的现象由此展开想像或结合你的实际经历以第一人称写一篇英语短文。内容应包括：1. 你的这次被误解的具体经历；2、你当时的心情； 3、你如何向长辈解释清楚你的“古怪”行为。

注意：1、词数不少于120；

      2、不能使用真实姓名和学校名称。

        3、“快闪”只是提供一个例子，你可以自由地选取任何“流行文化现象”进行描述

Although April did not bring us the rains we all hoped for, and although the Central Valley doesn’t generally experience the sound and lightning that can go with those rains, it’s still important for parents to be able to answer the youthful questions about thunder and lightning.

The reason these two wonders of nature are so difficult for many adults to explain to children is that they are not very well understood by adults themselves. For example, did you know that the lightning we see flashing down to the earth from a cloud is actually flashing up to a cloud from the earth? Our eyes trick us into thinking we see a downward motion when it’s actually the other way around. But then, if we believed only what we think and we see, we’d still insist that the sun rises in the morning and sets at night.

Most lightning flashes take place inside a cloud, and only a relative few can be seen jumping between two clouds or between earth and a cloud. But, with about 2,000 thunderstorms taking place above the earth every minute of the day and night, there’s enough activity to produce about 100 lightning strikes on earth every second.

Parents can use thunder and lightning to help their children learn more about the world around them. When children understand that the light of the lightning flashing reaches their eyes almost at the same moment, but the sound of the thunder takes about 5 seconds to travel just one mile, they can begin to time the interval (间隔) between the flash and the crash to learn how lose they were to the actual spark (闪光).

1.According to the author, in the area of the Central Valley____.

2.We believe that lightning is a downward motion because_______.

3.What is TRUE about lightning according to the passage?

4.The underlined word “activity”  is most closely related to the word (s) _____.

5.It can be concluded from the passage that _______.