Analysis of test questions: Bad temptation, like a virus, will affect physical and mental health, academic progress and induce crimes. So 123 is an accurate summary of the harm of bad temptation, and option A is the correct answer. The fourth statement is wrong in itself. Bad temptation not only affects the physical and mental health of minors, so it should be ruled out.

Comments: This topic combines the experiences of students of the same age to investigate the harm caused by bad temptations, which can bring some impact to students' thoughts, thus prompting students to treat the temptations around them correctly, consciously resist bad temptations, and achieve the purpose of ideological and moral education.