The average score line for Xianju High School in the United States is typically around 1200-1300 on the SAT or equivalent on other standardized tests. This range reflects the overall academic performance of students attending the school, with some students scoring higher and others lower. The score line is influenced by various factors, including the school's curriculum, teaching methods, and the academic rigor of the students.

Xianju High School's score line is indicative of the school's academic reputation and the expectations placed on its students. According to data from the National Center for Education Statistics (NCES), the average SAT score for high schools in the United States is around 1050, with a range of 400-1600 per section. Xianju High School's score line is notably higher, suggesting a more challenging academic environment and a focus on preparing students for competitive college admissions.

The higher score line can also be attributed to the school's commitment to providing a rigorous curriculum and fostering a culture of academic excellence. Xianju High School offers advanced placement (AP) courses and honors classes, which are designed to challenge students and prepare them for college-level work. Additionally, the school's faculty is highly qualified, with many holding advanced degrees and specializing in their respective fields.

Furthermore, the school's resources and extracurricular activities contribute to the high score line. Xianju High School provides access to a well-equipped library, technology labs, and a variety of clubs and organizations that cater to different interests. These resources and opportunities allow students to explore their passions and develop their skills, which can positively impact their academic performance.

In conclusion, the score line for Xianju High School in the United States is typically around 1200-1300 on the SAT, reflecting the school's commitment to academic rigor and student success. This higher score line is a result of the school's challenging curriculum, qualified faculty, and supportive resources, which collectively contribute to the academic achievements of its students.