题干

新开通的上海4号线地铁站采用先进的技术,在上车处设置了屏蔽门(如右图所示).当火车停稳后,屏蔽门才能打开,而当所有的屏蔽门都关上后,火车才能开动.如果没有屏蔽门,容易发生交通安全事故.下列解释正确的是(     )

A:火车周围的气流速度比站台里面的速度大,火车周围的风把人推离火车

B:火车周围的气流速度比站台里面的速度小,站台的风把人吹向火车

C:火车周围的气压比站台里面的气压小,站台的大气压把人压向火车

D:火车周围的气压比站台里面的气压大,火车周围的大气压把人吸向火车

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C

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    At what age does a child became an adult?____Here are a few examples.

    First, in some North American Indian culture, a boy became a man around the age of 13. At that time, he would go into the woods alone, without food or water, for several days.____Girls became adult women as soon as they were old to have babies, also around the age of 12 or 13.

    In the Jewish religion, children spend years studying their history and religion. Then, at age of 13 for boys and 12 for girls, they go through an important religious ceremony.____

    In Japan today, young people become legal adult at age 20. Each year on January 15th, they celebrate “Coming-of-Age Day”, when the 20-year-olds in a town are invited to attend to special ceremony.____

    Finally, in the United States, the passage into adulthood takes several years. American teenagers look forward to their 16th birthday because in most states that is the age when can get a driver's license. The legal age of adulthood is 18, when Americans can vote, get married and work full-time. However, they must wait until age 21 to buy alcohol.____

A. Many people celebrate their 21st birthday by having a drink with friends in a bar.

B. It's hard to answer the question.

C. The answer depends on your culture or religion.

D. From that day, they are adults, and they become responsible for their own religious development.

E. When he returned safely, he became an adult man.

F. The teenagers are not allowed to drink alcohol.

G. They wear traditional clothes, listen to speeches and visit old friends.