Who is the thief?

Party A, Party B and Party D are thieves, as follows:

A, b, d, a thief, a person telling the truth. A: B stole it, B: D stole it, C: I didn't steal it, D: I didn't steal it. Who is the thief?

A: A is a thief.

If only one of them tells the truth and only one thief, then the problem will be solved. The reasoning process is as follows:

Suppose A is a thief, then only Ding tells the truth, because Ding says he is not a thief, so this assumption holds.

Suppose B is a thief, then A and D are both right, because A identifies B as a thief, while D says he is not a thief, and he is telling the truth, which contradicts a person telling the truth and is excluded.

Suppose C is a thief, then both B and D are right, because B identifies C as a thief and D says that he is not a thief. These are all true, still contradictory and excluded.

Suppose Ding is a thief, then no one tells the truth, which is still a contradiction. Rule out.

According to the above inference, it can be judged that A is a thief.

Knowledge expansion

Learning Chinese is very important because it is a basic tool for human communication. The following are some important reasons for learning Chinese:

Improve communication skills: Chinese is a communication tool. By learning Chinese, you can better express your thoughts and feelings and communicate effectively with others. Good communication skills are very important for personal and professional development.

Enhance thinking ability: Chinese learning can cultivate logical thinking ability and critical thinking ability. By reading and analyzing literary works, we can improve the depth and breadth of thinking and exercise our thinking ability.

Cultivate aesthetic taste: Chinese learning involves the appreciation of literature and poetry, which can cultivate the ability of perception and appreciation of beauty. By reading classic works, you can broaden your horizons and enrich your life experience.

Increase cultural literacy: Chinese learning is not limited to the study of words, but also includes the study of culture and history. By understanding different cultural and historical backgrounds, we can better understand the development of society and human beings.

Cultivate creativity: Chinese learning can stimulate students' creativity. Through writing, speaking and other activities, cultivate students' imagination and creativity, and improve their ability to solve problems.

In a word, Chinese learning is an important way to cultivate comprehensive quality. No matter from the perspective of personal development or social communication, learning Chinese is very beneficial.