A．Arrangement. B．Size.

　　C．Number. D．Outline.

　　解析　词义猜测题。第一句话为本段的中心句。根据其后的内容可知，本段主要介绍了韩、美两国高中在班级人数、作息等方面组织(方式)、安排的不同之处，因此选A。

　　答案　A

　　4．According to the rules，the students of Korea can________.

　　A．go to different high schools without exams

　　B．wear any clothes except uniforms at school

　　C．attend different classes as they like

　　D．have different hair styles

　　解析　细节理解题。根据第四段的最后一句话“...it seems the only freedom students have is with their choices of hair style，socks and shoes.”可知，韩国学生唯一的自由就是可以选择发型、袜子、鞋子，故答案选D，即他们可以有不同的发型。

　　答案　D

　　Since the 1970s, scientists have been searching for ways to link the brain with computers. Brain-computer interface(BCI) technology could help people with disabilities send commands to machines.

　　Recently, two researchers, Jose Millan and Michele Tavella from the Federal Polytechnic school in Lausanne, Switzerland, demonstrated（展示）a small robotic wheelchair directed by a person’s thoughts.

　　In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right band. He could even talk as he watched the vehicle and guided it with his thoughts.

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