28．Why did UNESCO set April 30 as International Jazz Day?

　　A．To remember the birth of jazz.

　　B．To protect cultural diversity.

　　C．To encourage people to study music.

　　D．To recognize the value of jazz.

　　29．What does the underlined word “that” in paragraph 3 refer to?

　　A．Jazz becoming more accessible.

　　B．The production of jazz growing faster.

　　C．Jazz being less popular with the young.

　　D．The jazz audience becoming larger.

　　30．What can we infer about Moran’s opinion on jazz?

　　A．It will disappear gradually.

　　B．It remains black and white.

　　C．It should keep up with the times.

　　D．It changes every 50 years.

　　31．Which of the following can be the best title for the text?

　　A．Exploring the Future of Jazz.

　　B．The Rise and Fall of Jazz.

　　C．The Story of a Jazz Musician.

　　D．Celebrating the Jazz Day.

　　D

　　A buld-it-yourself solar still（蒸馏器） is one of the best ways to obtain drinking water in areas where the liquid is not readily available. Developed by two doctors in the U.S. Department of Agriculture, it’s an excellent water collector. Unfortunately, you must carry the necessary equipment with you, since it’s all but impossible to find natural substitutes. The only components required, though, are a 5＇ 5＇ sheet of clear or slightly milky plastic, six feet of plastic tube, and a container— perhaps just a drinking cup — to catch the water. These pieces can be folded into a neat little pack and fastened on your belt.

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