题目

实验课上,某小组的同学用生石灰进行“化学反应中能量的变化”实验时发现:向块状生石灰中加入适量水后没有明显的温度变化。为确定其原因,进行了如下实验探究。 【提出问题】生石灰是否变质?其成分是什么? 【查阅资料】氢氧化钙溶解过程中无明显温度变化,与盐酸反应无气体生成。 【猜想与假设】同学们认为生石灰样品已经变质,并对其成分作出了如下4种猜想。 猜想1:氧化钙和氢氧化钙; 猜想2:氧化钙和碳酸钙; 猜想3:氢氧化钙和碳酸钙; 猜想4:氧Summer Holiday Fun 2010 ! The summer holidays are upon us again. Here is our guide to summer holiday fun in Peterborough!Peterborough Museum The Age of the Dinosaurs is the museum’s main attraction this summer. Get up close to prehistoric creatures via some great hands—on exhibits! Watch out for monsters lurking around every ember! The museum is open from 10: 00am to 5: 00pm Monday to Saturday, and from 12: 00pm to 4: 00 pm on Sundays in August. Call 01733 864663 for detailsSaxon Youth Club School holiday fun: Young people aged 13-19 will be able to produce their own music, compete in spots activities, or try their hand at cooking at Saxon Youth Club，Saxon Community Centre, Norman Road. Peterborough every Monday and Wednesday from 3: 00pm. Moreover, an aero ball tournament will take place on Thursday 12th August between 3: 30pm and 6: 30pm. Call 0135 3720274 for detailsHoughton Mill    Alice through the Looking Class—a new production of the family favorite on Monday 30th August. Bring rugs or chairs to sit on and a picnic if you wish to eat during the play. Gates open 5: 30pm, performance 6: 30pm—8: 30pm. Tea room will be open until end of the interval. Adult ￡10. Child￡7. Family ￡20. Booking advisable on 0845 4505157. Farmland Museum and Denny Abbey Farmland Games: From Wellie Wading to Pretend Ploughing matches, come and join the Farmland Team. Collect your sporting stickers and create a colorful rosette that is fit for a winner！No need to book, just turn up between 12: 00pm and 4: 00pm on Thursday 19th August. Suitable for children aged four and above, each child should be accompanied by an adult and all activities are included in the normal admission price Tickets Cost￡7 per child. For further information, call 01223 810080. 53. If you are interested in cooking, you can go to______. A. Peterborough Museum                    B. Houghton Mill C. Saxon Youth Club                           D. Farmland Museum54. You want to watch the new play with your parents, so it will cost you______. A. ￡7          B. ￡17               C. ￡27                      D. ￡2055. Which of the following activities needs parents’ company? A. Playing farmland games               B. Watching a new play． C. Competing in spots activities．         D. Visiting the dinosaur exhibition．56. If Tom comes to Peterborough for amusement on August 19, he will have ______activities to choose from for himself. A. one activity    B. two activities        C. three activities   D. four activities