根据短文内容选择最佳答案。(Choose the best answers according to the passage．)

　　To study all the way to a 12th“grade”might sound strange to you．But not to an American student．

　　Most Americans have six years of primary school and six years of secondary school．Each year is called a grade．At about age six, American children start six years of primary school．During those six years, the children learn to read and write and do easy maths．They also learn history, science, health and P．E．Students in grades one through six usually only have one teacher for each year．They stay in the same classroom with the same students for all of their different subjects．

　　Secondary school has two parts：junior high school(sometimes called middle school)and senior high school．In the seventh grade, students begin to learn more subjects．They usually have between six and eight different classes every day．Each class has different students, and each one is taught by a different teacher．

　　Students have even more freedom in senior high school．Most students begin to study a foreign language like Latin, Spanish or French．There are also classes in business, computers and also courses like auto mechanics and farming．Besides their required classes, students can also choose a few classes that they're interested in, like art, singing and woodworking．

　　In most places in the US, students can drop out of school at age 16, but most kids choose to stay．After students finish school, they can choose to start working, go to school for two years to learn a profession, or go to college．

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　　In the United States, headmasters and teachers discipline(惩罚)students in several ways．The teacher often writes to or calls the students’ parents．Sometimes students have to stay at school for one hour．If a student behaves(表现)very badly, the headmaster can stop the student having classes．The student can’t come to school for one, two or three days．Mr．Lazares, the headmaster of a middle school in Ohio, did not like to do so．When he didn’t let the students come to school, they were happy．“A three-day holiday!”they thought．

　　One day, a boy was in Mr．Lazares’s office．The boy was not behaving well in class．Mr．Lazares telephoned the boy’s parents．“If you come to school with your son, I won’t stop him having classes,”he said．The boy’s father came to school and went with his son to every class．Other students looked at the boy and his father．The boy was embarrassed．After that he behaved better．And, of course, other students behaved better, too．

　　Now headmasters all over the USA are trying Mr．Lazares’s idea．They, too, think that students behave better when parents come to school．

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