Analysis of test questions: China has a vast territory, with the northernmost part on the central line of Heilongjiang main channel north of Mohe River (53 N) and the southernmost part in Zengmu shoal (4° N). From north to south, China spans nearly 50. It can be said that China has a large latitude span and a large temperature difference, which leads to different landscapes in the two places. B is right.
Comments: This question mainly examines the latitude position and four points in China, which is a basic question. Students should firmly grasp the reasons that affect the differences between North and South China, and flexibly use relevant basic knowledge: ① China has a vast territory, and the northernmost part is in the center of the main waterway of Heilongjiang (53 N) north of Mohe; The southernmost point is in Zengmu shoal (4 N); The westernmost point is in Pamirs (73 E); The easternmost point is at the intersection of Heilongjiang and Wusuli River (135 E); ); ② Latitude 0-30 degrees is low latitude, latitude 30-60 degrees is middle latitude, and latitude 60-90 degrees is high latitude.