The "three squares and seven lanes" in Fuzhou area is a treasure of history and culture, and is known as the "Museum of Ancient Buildings in Ming and Qing Dynasties". It is the essence of Fuzhou tradi

The "three squares and seven lanes" in Fuzhou area is a treasure of history and culture, and is known as the "Museum of Ancient Buildings in Ming and Qing Dynasties". It is the essence of Fuzhou traditional culture and the center of China. (1) The accumulation wall can't burn, and it can isolate flammable materials in case of fire next door, so choose C;

(2)① According to the needs of combustion, three conditions should be met at the same time: combustible, oxygen or air, the minimum temperature required for combustion is the ignition point, and the paper chafing dish will not be ignited by fire when used. The reason why it can't ignite is that the temperature doesn't reach the ignition point of paper, so the answer is: the temperature doesn't reach the ignition point of paper;

② Alcohol combustion produces water and carbon dioxide. The literal expression of combustion is: alcohol+oxygen ignites water+carbon dioxide; So the answer is: alcohol+oxygen ignition water+carbon dioxide;

(3) The physical properties of tea polyphenols are: white powder, easily soluble in water; "Smelling the fragrance" is a part of tea tasting. Microscopically, the reason for smelling tea is that molecules are constantly moving; So the answer is: white powder, easily soluble in water; Molecules are constantly moving;

(4) Harmful gases and smoke in air pollution. The main harmful gases are: carbon monoxide, nitrogen dioxide and sulfur dioxide, all of which are included in the air pollution index; So: ACD；;

②PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 microns in the atmosphere, also known as particulate matter that can enter the lungs, so setting off fireworks will produce PM 2.5PM2.5, which is one of the "culprits" causing haze weather; PM2.5 means that the diameter in the atmosphere is less than or equal to 2.5 microns, so it is much larger than molecules; So, the answer is: c;

③ It can play a positive role in the control of PM2.5, mainly by reducing the release of particulate matter, such as reducing thermal power generation; Advocate the use of hydropower and solar power generation; Actively plant trees to prevent dust pollution (the answer can be from reducing fossil fuel combustion, using clean energy, planting trees to control dust, and discharging industrial waste gas after treatment). So the answer is: actively plant trees to prevent dust pollution.