Read the weather system chart of some parts of China at a certain time in spring and answer questions 37-38. The area where the four lines A, B, C and D are located is sunny (

A and C are controlled by low pressure, the airflow rises vertically, and it rains continuously, which is wrong; D is controlled by low pressure, and the airflow rises vertically. It is rainy weather, so it is wrong, so it does not meet the meaning of the question;

B, A and B are controlled by high pressure, the airflow sinks in the vertical direction, and the weather is fine, so it is correct;

C and A are controlled by high pressure, vertical air sinks, and the weather is fine and correct; C is controlled by low pressure, and the airflow rises vertically. It is rainy weather, so it is wrong, so it does not meet the meaning of the question;

D and B are controlled by high pressure, the airflow sinks vertically, and the weather is fine and correct; D is controlled by low pressure, and the airflow rises vertically. It is rainy weather, so it is not right.

Therefore, choose: B.