Multiple choice questions about weather system

A and A are cyclones, and the cold wave is formed by the influence of cold front, which does not conform to the meaning of the question; B and B are anticyclones, and the dry weather in the Yangtze River basin in summer is influenced by subtropical high, so it is correct. C and C are cold fronts, and the typhoon is a tropical cyclone, which does not meet the meaning of the question; D, D are warm fronts, and the rainstorm in northern China in summer is caused by cold fronts, which does not meet the meaning of the question.