mini还是全文听写模式，很多童鞋可能进来看到【专八】可能会有点胆怯，刚开始是会感觉到有点吃力哦，但这就是专八。希望大家可以耐心的认真听写O(∩_∩)O~

Hints:
U.S. Census Bureau
A (excellent)
B (above average)
C (average)
D (below average)
F (failing)
High school students are required to take a wide variety of courses in English, mathematics, science, and social science. They may also be required to take foreign language or physical education, and they may elect to take music or art courses. Many high schools also offer vocational training courses. A course can be one semester or two semesters in length. The academic year generally begins in late August and ends in early June. In the United States, education is compulsory for all students until age sixteen. According to the U.S. Census Bureau, 85% of students graduate from high school. Most high school students graduate at the age of 17 or 18 years-old. A student graduates after he or she has successfully passed all of the required courses. Grades are given to students for each course at the end of each semester. The grading scale is A (excellent), B (above average), C (average), D (below average), and F (failing). A student who fails a required course must take the course again.