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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完形填空阅读下面短文, 掌握其大意, 然后从各题所给的四个选项(A、B、C和D)中, 选出最佳选项. The worst tourist in the world is perhaps Mr Scotti in San Francisco(旧金山). Once he __1__ from the U. S. to his hometown in Italy(意大利) to see someone at home. The __2__ made a one-hour stop to get something at Kennedy Airport of New York. __3__ he thought he had arrived home, Mr Scotti __4__ the plane. He thought he was in __5__. When nobody was there to __6__ him, Mr Scotti thought maybe they were held up by heavy traffic. While looking for __7__ addresses, Mr Scotti found that the old "Rome" had changed a lot. Many __8__ buildings were replaced(替代) by high modern ones. He also found that many people spoke __9__ instead of Italian and that many street signs were written in English. Mr Scotti knew very little English, so he asked a policeman the __10__ to the bus station in Italian. Luckily, the policeman was also born in Italy and answered him in __11__ language. After twelve hours' traveling round on a bus, the driver handed him over to __12__ policeman. He asked the policeman __13__ the Rome police employed(雇佣)so many people as policemen speaking English instead of Italian. Mr Scotti did not believe(相信) he was in New York when he was __14__ so. To get him on a plane back to San Francisco, he was sent to the airport in a police car __15__ sirens(警报器) on. "Look," said Scotti to himself, "I know I'm in Italy. That's how they drive. "

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