The reason for the large temperature difference in winter in our country is double choice 5

a c The first is the latitude factor. The north-south span of China is very large, and the difference in latitude directly leads to the difference in the solar altitude angle and the uneven distribution of heat. The direct solar exposure point in the southern hemisphere in the winter half of the year, the distribution law of the solar altitude angle in the northern hemisphere is that the higher the latitude, the smaller the solar altitude angle, the weaker the solar radiation, and the smaller the heat received by the locality, so the heat in the north is less than that in the south, resulting in a certain temperature difference between north and south.

Then consider the monsoon factor. The coastal zone of our country is greatly affected by the monsoon. Due to the difference in the nature of land and sea, the continent forms a cold high pressure while the Pacific Ocean forms a warm high pressure, which promotes the formation of the winter monsoon.

The cold air blowing from Siberia (northwesterly winds) brings drastic cooling to the north.

Another important factor is the topography. Often the cold air does not have a profound impact on the south, that is because there are many tall mountain ranges in the east-west, northeast-southwest direction in China, such as the Daxing'an Mountains, Yinshan Mountains, Helan Mountains and so on. After their reduction effect, the power of cold air has been reduced a lot, and if you want to reach the south, you have to cross the Qinling Mountains, which runs east-west mountains, the power is naturally greatly reduced, so the formation of the north-south temperature difference is exacerbated.

In winter, the days are short in the north of our country, the height of the sun at noon is small, the ground receives less solar heat, and the temperature is low, while in the south, on the contrary, the temperature is high; The northern part of China is close to the source of the winter monsoon, which is strongly affected by the winter monsoon and the temperature is low. The southern region is far away from the source of the winter monsoon, and the strength of the winter monsoon weakens during the southward movement, which has little impact on the southern region and the temperature in the south is high.

There is a large difference in temperature between the north and the south in winter, the south is warm, and the temperature is lower the further north you go

The north and south of China span a large latitude, and the direct sun is in the southern hemisphere in winter, and the further north you go in the northern hemisphere, the lower the solar altitude angle, and the less solar heat The south of China is more affected by solar heat due to its low latitude and large solar altitude angle;

The north of China is close to the birthplace of the winter monsoon, which is obviously affected by the winter monsoon and the cooling range is large, while the south of China is far away from the birthplace of the winter monsoon and is blocked by the tall mountains, the influence of the winter monsoon is not obvious, the cooling range is small, and the temperature is high

BA is also very important. China has a lot of east-west mountain ranges that hinder the southward movement of the winter monsoon. The United States does not have east-west mountain ranges that cannot hinder the southward movement of the winter monsoon, and the temperature difference between north and south in winter is not very large.

[Analysis].

Latitude is an important factor affecting the temperature distribution in China. China has a vast territory, spanning nearly 50 degrees of latitude from north to south. In winter, the direct point of the sun is in the southern hemisphere, and the noon sun height in the north of our country is lower than that in the south, and the days and nights are short.

In addition, the winter winds frequently move southward, and the north of our country bears the brunt, and the cold winter winds have exacerbated the severe cold in the north of our country. During the southward movement of the winter monsoon, it was blocked by heavy mountains and gradually weakened. The southern part of the country is much less affected by the winter monsoon and cools down to a much lesser extent than in the north.

Therefore, the further north our country goes in winter, the lower the temperature, and the temperature difference between the north and the south is very large.

Answers] A, D

【Answer】a

Answer Analysis] Test Question Analysis:

The main reason for the large temperature difference between the north and south in winter in China is that the north and south latitudes are large, the northern latitude is high and the temperature is low, the southern latitude is low, the temperature is high, and the temperature difference between the north and the south is large.

Test center: This question mainly examines the diversity of climates and the significant monsoon.

The reason for the large temperature difference between the north and south in winter in China is due to the combination of latitude, winter monsoon and topography.

1. The influence of latitude position:

The southern and northernmost parts of China span a large latitude (close to 50°), and the direct sun is located in the southern hemisphere in winter, while the noon sun height is small and the days are relatively short in northern China. The surface of the earth receives less sunlight and heat, and less heat is transferred to the air, resulting in low temperatures. In southern China, the sun is relatively high at noon and the days are relatively long.

The surface of the earth receives more sunlight and heat, and more heat is transferred to the air, and the temperature is higher than that in the northern region. The average temperature in January in winter in China is nearly 50°C higher in the south than in the north.

2. The influence of winter monsoons:

In winter, due to the large land area in the middle latitudes of the Eurasian continent, there is a significant thermal difference between sea and land. Temperatures on the continent are lower than in the oceans at the same latitude. In the mid-latitudes of the Eurasian continent, the air contracted and sank, forming the Asian high pressure.

The southerly airflow of the Asian high affects China and surrounding countries in the form of northwesterly and northeasterly winds. As the northerly winds come out from high latitudes, they bring intense cooling. Some parts of China are close to the source of the winter monsoon, which is strongly affected by the winter monsoon, with a large cooling range, and the temperature in the north is low.

The southern region is far away from the source of the winter wind, and the cooling range is small, and the temperature is relatively high. The winter monsoon can also cause a large temperature difference between the north and the south.

3. The influence of terrain:

There are some phenomenal mountain ranges in eastern China. When the winter monsoon moves southward, it has a strong impact on the northern regions, resulting in low temperatures in the north. The winter wind encountered the obstruction of the Qinling Mountains, and its power was greatly weakened.

The winter monsoon will continue to move southward, and it will be blocked by the South Ridge, and the force will be further weakened. When the winter monsoon reaches the south of Nanling, the force is very weak, and the cooling range is very small, and it is relatively high in the southern region.

Alas, summer is hotter than winter.

China is located in the northern hemisphere, spanning nearly 50 latitudes from north to south In winter, the sun shines directly in the southern hemisphere, for the northern hemisphere, the higher the latitude, the lower the noon solar altitude angle The noon solar altitude angle in northern China is lower than that in the south, the days are shorter, and the light and heat of the sun are less Therefore, the low temperature in the northern part of Heilongjiang Province in China can reach -30 -40 in winter, and the dripping water becomes ice; The average winter temperature in Hainan Province is around 20, the climate is warm and hot, and the trees are full of shade

Therefore, b

Answer B: This question mainly tests the knowledge of China's climate. The main reason for the large temperature difference between the north and the south in winter in China is the location of latitude.

Answer B Implicit Analysis: The main reason for the large temperature difference between the north and the south in winter in China is that the north and south latitudes are large, the northern latitudes are high and the temperature is low, and the southern latitudes are low, the temperature is high, and the temperature difference between the north and the south is large. Zhenpei.

Test point: This question tests the knowledge of China's climate.

Comments: There are latitude factors, sea and land factors and topography factors that affect the temperature of Yuxiwei, and the reason for the large temperature difference between north and south in China is mainly latitude factors.

Answer D: This question mainly tests our knowledge about the climate. The main reason for the large temperature difference between the north and the south in the winter season in China is that the north and south latitudes are large, the north latitude is high, and the temperature is low and the temperature is high in the south of the country.