Lan Lan's home is in Chongqing and Lingling's home is in Shanghai. They sent messages to each other on the Internet and began to study the Yangtze River. Please help them.

(1) According to the data, if we want to compare the topographic differences between Chongqing and Shanghai, the data we need are ⑤ mountains, canyons, ⑤ plains and hills.

Lingling invited light light blue to go to Shanghai from Chongqing, and light light blue chose water transportation as the most suitable way.

(3) Shanghai-Nanjing-Hangzhou Industrial Base is the largest comprehensive industrial base in China, with Shanghai as the center.

(4) As can be seen from the data, the advantages of Chongqing are: (3) intensive industry and advanced technology; (4) Smooth information and abundant funds; The advantages of Shanghai are: ① rich in coal and minerals; ② Sufficient water and electricity.

(5) Chongqing and Shanghai can complement each other's advantages, such as sending electricity from the west to the east, and the east supports the west with the advantages of technical information, education, culture and capital.

(6) Shanghai is the largest commercial center, an important science and technology education center, an important financial center and the largest comprehensive industrial base in China.

So the answer is: (1) ⑤; ⑥; (2) water transportation; (3) Shanghai-Nanjing-Hangzhou; (4)③、④、; ①、②; (5) Power transmission from the west to the east, and the east supports the west with technical information, education, culture and capital advantages; (6) The largest commercial center, important science and technology education center, important financial center and the largest comprehensive industrial base in China.