There is only one reason for ABC three people, and the exclusion method can be used.
If a is true, a is green. So b is not yellow, c is not green and d is blue.
If b is true and b is green, this contradicts b's description.
If c is true, then c is green. Then d is not blue. So B is yellow and C is not green, which contradicts the premise.
So, A is green, B is red, C is yellow and D is blue. There is no correct answer.
Check your question, is it "D is not telling the truth" in the stem?
First, cultivate the flexibility of students' thinking.
Transfer is the influence of one kind of learning on another. In primary school mathematics teaching, we should scientifically apply the transfer law, strengthen the training of students' basic knowledge and skills, and cultivate students' flexibility of thinking.
Second, cultivate students' thinking of seeking the opposite sex.
Differentiated thinking means that the path of thinking spreads to all possible directions, and leads to more information, so that thinkers can start from various ideas, not stick to one way, and the layout is limited to established knowledge, and make as many answers as possible.
Third, cultivate the originality of students' thinking.
It is impossible for students in the lower grades of primary school to create new knowledge. Cultivating students' thinking requires students to find another way and seek original solutions on the basis of general problem-solving methods.