C. a big food party with music performances D. a traditional holiday with music and food

　　22. What does the underlined word "stars"in the first paragraph refer to?

　　A. Big movie stars B. Famous cooks or bands

　　C. Guests at an evening party. D. Famous musicians or singers

　　23. If you buy tickets online for the festival, you can _________.

　　A. choose where to sit B. get some discount

　　C. decide the time of any performance D. change the date of an event after payment

　　24. If you want to experience Ravinia Festival, you can_________.

　　A. go to Chicago in April B. make a call at weekends

　　C. go to Chicago in the summer D.visit www.ravinia.org before April

　　How to deal with waste has been a problem since humans started producing it. As more and more people choose to live close together in cities, the waste-disposal (处理) problem becomes increasingly difficult.

　　 During the eighteenth century, it was usual for several neighboring towns to get together to select a faraway spot as a dump site. Residents or trash haulers (垃圾拖运者) would transport household rubbish, rotted wood, and old possessions to the site. Periodically (定期地) some of the trash was burned and the rest was buried. The unpleasant sights and smells caused no problem because nobody lived close by.

　　 Factories, mills, and other industrial sites also had waste to be disposed of. Those located on rivers often just dumped (倾倒) the unwanted remains into the water. Others built huge burners with chimneys (烟囱) to deal with the problem.

Several facts make these choices unacceptable to modem society. The first problem is space. Dumps, which are now called landfills, are most needed in heavily populated areas. Such areas rarely have empty land suitable for this purpose. Property is either too expensive or too close to residential (住宅区的) neighborhoods. Long-distance trash hauling has been a common practice, but once farm