In American high schools, most students (41) English, science, math and history (历史,履历). These are basic (基础) courses and each course (过程,教程) is as (42) as the others. In English class, the students study grammar (语法) and read famous literature (文学). In science class, they study biology (生物学), chemistry (化学) or physics (物理). History is more interesting (43) some students because they (44) about important events (事件) and places in the United States. Students take other, courses, too. These are electives (先修课程). Some of them are music, home economics (家政学) and computer science. Students don’t (45) take all of these courses. Some study music because they feel it is more (46) . Some study computer science because they think it is more practical (实用的). In (47) class, teachers give students exams. Some exams are (48) difficult than (49) , but a good student can (50) do well.