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Transfer of education system
It is better and more representative to participate in the comprehensive discussion of school management by systematic sampling;

It is more appropriate to adopt stratified sampling in the research of mathematics teaching and learning, so that the research can better reflect students of different levels;

"Lucky star" can't be sampled systematically, so it doesn't have the meaning of "lucky".

The appropriate sampling method is simple random sampling,

To show "luck".

So choose d