Meaning: Metaphorically, a person with good quality and strong will can stand any test.

From: Sunny Days, chapter 1 15, by Ran He.

The original text is: "Dark clouds can't cover the sun, and real gold is not afraid of fire. Dongshanwu will always be the sun in the sky and the world of our people forever! "

The historical allusion of "real gold is not afraid of fire";

In ancient times, a big family caught fire and the house was burned down. There is nothing left at home, except copper, iron, silver and other utensils, furniture and jewelry. In the ashes, only a lot of gold cakes were found, and then the weight of the gold cakes was weighed, just like the previous gold jewelry. So people thought that if everything else could melt, gold would not melt.

"Melting" here does not mean melting, but actually refers to chemical changes. Everything else disappeared in the fire, only gold. Although it has changed its shape, it still shines and its weight remains the same.

Extended data:

The chemical principle that "real gold is not afraid of fire";

Just because real gold is not afraid of fire does not mean that gold cannot be melted by fire, because the melting point of gold is really not high. However, the chemical stability of gold is very high, and it is not easy to react with other substances, so there is no need to worry about oxidation discoloration. Even in the molten state, it will not be oxidized and discolored, and it will still be golden yellow after cooling. At the same time, the volatilization of gold in molten state is very small and can be ignored.

Therefore, even if the gold is melted, the gold nugget obtained after cooling is the same color and weight as the gold before combustion, and there is no oxidation loss. Although other metals such as copper and iron have higher melting points than gold, they are far less chemically stable and will be oxidized at room temperature. Even if the melting temperature is not reached, the degree of oxidation reaction at high temperature will greatly increase. It will definitely change color after cooling, and the weight after oxide removal is definitely not as good as before burning.

Baidu encyclopedia-real gold is not afraid of fire.

2. What is the next sentence that real gold is not afraid of fire? True blue will never stain.

Meaning: Metaphorically, a person with good quality and strong will can stand any test. From: Sunny Days, chapter 1 15, by Ran He.

The original text is: "Dark clouds can't cover the sun, and real gold is not afraid of fire. Dongshanwu will always be the sun in the sky and the world of our people forever! " The historical allusion of "real gold is not afraid of fire": in ancient times, a large family caught fire and the house burned out. There is nothing left at home, except copper, iron, silver and other utensils, furniture and jewelry.

In the ashes, only a lot of gold cakes were found, and then the weight of the gold cakes was weighed, just like the previous gold jewelry. So people thought that if everything else could melt, gold would not melt.

"Melting" here does not mean melting, but actually refers to chemical changes. Everything else disappeared in the fire, only gold. Although it has changed its shape, it still shines and its weight remains the same. Extended data:

The chemical principle of "real gold is not afraid of fire": real gold is not afraid of fire because its melting point is really not high.

However, the chemical stability of gold is very high, and it is not easy to react with other substances, so there is no need to worry about oxidation discoloration. Even in the molten state, it will not be oxidized and discolored, and it will still be golden yellow after cooling.

At the same time, the volatilization of gold in molten state is very small and can be ignored. Therefore, even if the gold is melted, the gold nugget obtained after cooling is the same color and weight as the gold before combustion, and there is no oxidation loss.

Although other metals such as copper and iron have higher melting points than gold, they are far less chemically stable and will be oxidized at room temperature. Even if the melting temperature is not reached, the degree of oxidation reaction at high temperature will greatly increase. It will definitely change color after cooling, and the weight after oxide removal is definitely not as good as before burning.

Baidu encyclopedia-real gold is not afraid of fire.

Proverbs and poems contain scientific truth. The following statements are correct: (a) "Real gold is not afraid of fire" and "Real gold is not afraid of fire" mean that gold is chemically inactive and does not react easily at high temperature; Instead of "the melting point of gold is very high", the original explanation is wrong;

B, "the fire is high when people gather firewood" means that the more combustible materials, the more heat is released; Instead of "the more combustible materials, the lower the ignition point, the easier it is to catch fire", because the ignition point of combustible materials is generally unchangeable, so the original explanation is wrong;

C. "Steelmaking" means that the carbon in pig iron is converted into carbon dioxide after tempering, which is a chemical change; "Kung Fu is ground into a needle with a deep iron pestle."

What happens is a physical change; It contains different chemical principles, so the original explanation is wrong;

D, because there is "carbon dioxide, calcium carbonate and water react to produce calcium bicarbonate" in the process of "water dripping and stone penetrating", this is a chemical change. Therefore, "water drops pierce the stone" contains chemical changes, so the explanation is correct;

Therefore, choose: d.