Geography is related to weather problems~ Be anxious, choose a topic + a big question~

8-9.D;D From the weather activity on the vertical plane in the picture is the passing of a cold front, then m is sunny and n is rainy. It can also be concluded that the pressure at m is higher than that at n, then the weather condition in the picture is The central high pressure, m is in the high pressure ridge, and the wind blowing from the high pressure center changes from the northwest to the northeast under the influence of the earth's gravity.

10-11.A* Since I personally think that the picture lacks certain conditions, I first default to the north, and then make the following judgments: First, from the prompts, we can know that the pressures of abcd are both 1006, and abcd are respectively 50, 100, 150, 200m high (for questions about elevation, please refer to Baidu: Elevation). It can be seen that the higher the altitude, the lower the air pressure. At the same altitude, if the air pressure is a

11. By It can be seen from the picture that the picture describes the situation when the cold front passes through. Zhengzhou and Xi'an are the two situations before and after the cold front passes through. Needless to say, Zhengzhou: rain, low pressure; Xi'an: sunny, air pressure rises to moderate. In addition, if you think the data in this picture is correct, you can use it as an example of a cold front passing through to study the weather conditions before and after the cold front passes through. This is a dynamic situation, so you need to think more about it. For example, after the cold front passes through Zhengzhou , Xi'an may face the situation of Land A, etc. Because depending on the question, this exercise should be about air pressure. Mastering a figure is always more vivid and easier to understand than text. Of course, I suggest you ask your teacher first to see if the figure is trustworthy.