2．The underlined word "observe" in Paragraph 1 means "________"．

　　A．obey B．watch

　　C．notice D．report

　　解析：选A　词义猜测题。根据第一段中的"if you don't want to hurt yourself or your lab partner"可推断出observe在句中的意思是"遵守"。如果你不想伤害自己或同伴，一定要严格遵守安全规则。

　　3．Having long hair can be dangerous when you ________.

　　A．roll up long sleeves

　　B．use an alcohol lamp

　　C．use a sharp instrument

　　D．work with dangerous chemicals

　　解析：选B　推理判断题。第五段主要讲的是在实验室用酒精灯时要注意的事项。由此可推断出，长头发在使用酒精灯时可能有危险。

　　4．What's the best title for the passage?

　　A．Ways to do experiments

　　B．Exciting or dangerous?

　　C．Safety rules in the science lab

　　D．Observe carefully in the lab

　　解析：选C　标题归纳题。文章主要讲的是在实验室要遵守的安全规则，故C项为最佳选项。

　　B

　　"I really like dancing，" says 11­year­old Jonathan Rosario of New York City. "That's what I want to be when I grow up - a dancer."

　　Every Saturday, Jonathan and hundreds of other children from New York City public schools take classes at National Dance Institute (NDI). The nonprofit organization in Upper Manhattan was founded in 1976 by dancing star Jacques d' Amboise, who grew up in a tough (充满犯罪与暴力的) neighborhood. It has been teaching school children how to dance through weekly classes for over 30 years. NDI also supports programs in New York City public schools, helping thousands of children to express themselves creatively.

　　On a recent visit to NDI, I watched as Jonathan and other students practiced for an upcoming performance. I also spoke with d' Amboise about the influence that dance has had on his life and why he started a program for children.

　　"Dance changed me，" he said, "and I'd like to see other young people - especially boys - have the arts in their life, using dance as a window."

For d' Amboise, dancing is like competitive sports. Ice hockey (冰球) players, for