question: inorganic:compounds
choices.label: A B C D
choices.text: chinese herbal medicine:wild vegetables carbon dioxide:organic salt space:time atom:electron
explanation: some "inorganic" are "compounds", and some "compounds" are "inorganic"; "compounds" can be divided into organic compounds and inorganic compounds. "chinese herbal medicine" includes animal medicine and botanical medicine. "chinese herbal medicine" can be "wild vegetable", and "wild vegetable" can be "chinese herbal medicine", such as purslane, perilla and so on. "carbon dioxide" is an inorganic substance, and "organic salt" is a salt formed by proper neutralization of organic acids and alkaloids. there is no obvious logical relationship between "carbon dioxide" and "organic salt". the two dimensions in which the world is presented are "space" and "time", and "space" and "time" are one category. the nucleus and the "electrons" moving around the nucleus make up an "atom".
relation: inorganic compounds R2.7
relation: chinese herbal medicine wild vegetables R2.7
relation: space time R2.4
relation: atom electron R2.3