The profiles not only show travelers’ reviews, but also tell the scenic areas which services need to be improved.

　　Big data is also an important growth engine(增长引擎) for economic development. With an annual growth rate of 30 percent, sales of big data services and products in China will reach 1 trillion yuan yearly by 2020, China News Service reported.

　　51. What is “ big data”?

　　A. Technologies and habits.

　　B. Information from websites.

　　C. Numbers and information.

　　52. What is the purpose of developing “ big data” in China?

　　A. To make it an international trend.

　　B. To collect as much information as possible.

　　C. To better serve the development of China.

　　53. The underlined words “ scenic areas” in Paragraph 5 might mean ______ in Chinese.

　　A. 景区 B. 景象 C. 环境

　　54. The writer gives the example of tourism in order to ______.

　　A. attrACT readers to travel around the country

　　B. help travelers learn to use online profiles

　　C. show how “ big data” is used in China