Test analysis: According to the material "Baishan Blackwater falls into the enemy, Northeast China falls ...", it can be seen that the Japanese army occupied Northeast China. 193 1 year, the Japanese launched the September 18th Incident and occupied the Northeast, so C? . July 7th Incident 1937 Full-scale invasion of China; Shanghai was invaded after the December 28th Incident 193 1 year; The August 13th Incident invaded Shanghai after the July 7th Incident. It has nothing to do with "Baishan Blackwater"

Comments: The key to answering this question is to read the material carefully and find the key words. White mountain, black water and occupation of Northeast China can give the desired information. We should also grasp the historical background of Japan's invasion of China, such as the July 7th Incident, the December 28th Incident and the August 13th Incident.