题目

如图，三角尺在灯泡O的照射下在墙上形成影子，现测得OA=20cm， =50cm，则这个三角尺的面积与它在墙上所形成影子图形的面积之比是________。 答案：4：25 【解析】∵，∴三角尺的面积与它在墙上形成的影子的面积的比=．New Year’s Eve is a time to celebrate and enter the new year with a smile on your face. This year, there’re plenty of local activities for all ages and interests, so the smiles will come easily.BLUE CONCERT Blues band the Coyotes is playing at the Dance Barn，at 8 Barn View in Sudden Valley, The show will start at 9 p. m. and benefit the charity Bikers Fighting Cancer. Tickets cost $10 in advance and $15 at the door. Call 224-2308 for more information.NEW YEAR’S LAUGHSRing in the New Year and laugh out the old one at the Upfront Theatre Comic improvisers will hit on all the highlights of the year with The Last Laugh of 2008. The 9 p. m. show will cost $15 and is open to all ages. The 11 P. m. show is to 21 and older and costs $18, which includes a champagne (香槟酒) toast. Call 733-8855 for more information.MAZEFor a fun activity earlier in the evening，walk the labyrinth (迷宫) at the Leopold Crystal Bellroom. Wander through the maze, based on the French Chartres Cathedral, for free from 4 to 9 P. m. Call 752-0048 for more information.COUNTRY DANCINGAt the Bellingham Eagles Hall, live local music will help get the dance started at 8 p. m. Tickets are $15 for adults, $10 for students and free for kids 12 and younger. For more information, call 676-1554.1.In what way do these activities have in common?A.They’re all held in the same day.B.They’re all held by the same organization.C.They’re all organized for children.D.They’re all about the dancing and music.2.Which of the following activities may be free for Tom aged 16?A.COUNTRY DANCING.B.NEW YEAR'S LAUGHS.C.MAZE.3.If you want to know something about the Coyotes at 8 Barn view, you'd better call _______.A.676-1554B.733-8855C.752-0048D.224-23084.Which of the followings will be the highlights of NEW YEAR'S LAUGHS?A.Wander through the maze.B.The champagne toast.C.Its live music.D.The Last Laugh of 2008.5.It can be inferred from the text that ___________. A.$10 is enough to book a ticket to Blue ConcertB.you can read the text on a telephone bookC.all these activities are international onesD.New Year’s Laughs will hold shows three times