阅读下列短文，根据短文内容，完成表格。（每空填1-2个词）
In American high schools, most students take English, science, math and history. These are basic course
and each course is as useful as the others. In English class, they study biology, chemistry or physics. History
is more interesting to some students because they learn more about important events and places in the United
States. Others are music, home economics, and computer science. Students don't have to take all of these
courses. Some study music because they feel it more enjoyable. Some study computer science because they
think it is more practical. In each class teachers give students exams. Some exams are more difficult than
others, but a good student can do easily.
Courses of American High School
，式中，t为时间，v0、g为常数。点的运动轨迹应为（）。
，将其代入第二个方程，可得抛物线方程y=
