Analysis of test questions: the teaching of treating parents correctly and its relationship with parents in item B are wrong and cannot be selected; In C and D, Lan Lan and Qiang Qiang didn't realize the importance of youth to themselves, didn't cherish youth and didn't regret it. This is wrong, so they can't be selected. Item A, Sisi studies hard and actively participates in various beneficial interest group activities, which is a concrete manifestation of cherishing youth, will enrich his youth, conform to the meaning of the question, and be selected.