阅读下面的短文，从每题所给的A B、C三个选项中选出最佳选项回答问题或完成句子。

    An international expo（ 产品博览会） on big data （数据） opened on Wednesday in southwest China's Guizhou Province，showing the newest scientific and technological creations and achievements in the relevant area，May 26，2021.

    Big data （数据） is a lot of sets of information that are put together so they can be used by a computer program.The computer program looks for different kinds of answers or patterns in the data.Big data can have different kinds of information that comes from schools，social media sites，companies，and governments.One set of data can have people's names and addresses.Another set can have what they like，where they go to school，and how much time they spend on the computer.

    President Xi Jinping called for China to speed up its big data strategy（成略） in order to better serve social and economic（经济） development and improve people's lives.In the past few years big data has been used more often in China.The government uses it to understand how many people travel on buses or trains.The information is then used to make bus or train systems better.

    Some schools use big data to understand which children may need extra（额外的） help in class.The teacher can give certain students more help or support so those students can succeed in school.The role it plays in tourism is another example.The data travelers share online is offering the tourism industry a lot of information about the country's scenic areas（景区）.After the data is analyzed（分析），different scenic areas can create their own online information for other travelers to see.The information not only tells travelers' reviews，but also tells the scenic areas where services need to be improved.

（1）The international expo big data probably opened in 　 　.

A.Hengyang

B.Guiyang

C.Shenyang

（2）What does the underlined word "they" in Paragraph 2 refer to ？ 　　

A.Computer programs.

B.Social media sites.

C.Sets of information.

（3）Which purpose of speeding up big data strategy is NOT true according to President Xi Jinping 's opinion？ 　　

A.To better serve social and economic development.

B.To improve people's lives.

C.To protect the environment.

（4）Some schools use big data to 　 　 according to Paragraph 3.

A.find out how many students travel on buses or trains

B.help students in need

C.offer students information about the scenic areas

（5）We can read the passage 　　.

A.on a movie poster

B.In a story book

C.on a news website