阅读理解。 GUANGZHOU-China's first inter-city subway, linking two Southern Chinese cities hosting the 2010 Asian Games, started operations on Wednesday, Nov.3, 2010. The 21-kilometer Guangfo Line connects Guangzhou City with Foshan City, both in the manufacturing hub of the Pearl River Delta region in Guangdong Province. Riders on the subway will find that the travel time between the two cities has been reduced from 90 minutes to 30 minutes, said sources with the subway company Guangzhou Metro. The line has 14 stations and a ride from end to end costs only six yuan (less than $1). Local authorities have been pushing for the increased integration of cities in the Pearl River Delta and consider the operation of the Guangfo Line a big step in that direction. The subway was purposely opened one week prior to the start of the 2010 Asian Games. The competitions will be held in Guangzhou, Foshan, Dongguan, and Shanwei. 1. The above passage is _____. [     ] A. a piece of news B. a popular song C. a text from a book D. a science report 2. The underlined word 'hub' in the second paragraph is similar to _____. [     ] A. side B. bottom C. top D. centre 3. The 21-kilometer Guangfo Line is _____ inter-city subway in China. [     ] A. the fourth B. the third C. the second D. the first 4. Riders on the line will reduce their travel time by _____. [     ] A. one third B. two thirds C. one half D. three quarters 5. The Guangfo Line is considered a big step _____. [     ] A. to step up the connections between cities in the Pearl River Delta B. to reduce the transportation pressure between Guangzhou and Foshan C. to reduce the travel time between Guangzhou and Foshan D. to develop the economics in Foshan