2. Fools Eat Cake is about a person who is hungry and wolfs down a piece of cake. He doesn't feel full. He ate five cakes in a row, but he was still not full. So he ate the seventh cake, and just halfway through, he felt full.
Men regret it very much and think; I'm full today, because I ate this half cake, and all the six I ate before were wasted. If I had known that I would be full after eating this half cake, I would have eaten this half cake first.
3. In chemical reactions, the types of products are different with different amounts of reactants. For example, carbon burns in oxygen, and zinc reacts with sulfuric acid. Different experimental conditions (such as temperature) lead to different products. Such as charcoal, to reduce copper oxide.
Antibiotics can kill bacteria, but with the increasing use of antibiotics, it is more and more difficult to kill bacteria.
5. Under ordinary atmospheric conditions, people live normally; When the oxygen content in the air increases, it will produce symptoms similar to "drunk oxygen". When the oxygen concentration exceeds 70%, "oxygen" poisoning will occur. When the ozone concentration is low, it has disinfection effect, and when the concentration is high, it will cause headaches, paralysis and other hazards. And ultraviolet light.
6. The state issues currency to adapt to economic development. The increase of issued currency can promote the economy to a certain extent. However, if the amount of money issued by the state increases to a certain extent, it will devalue the currency and seriously cause economic recession.