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下列实验操作、实验现象及结论均正确的是 （）选项实验操作实验现象结论A向溶液X中先滴加稀硝酸，再滴加溶液出现白色沉淀溶液X中一定含有B 向淀粉溶液中加适量 ， 溶液，加热，冷却后加NaOH溶液至溶液呈中性，再滴加少量碘水溶液变蓝淀粉未水解C取少量X溶液于试管中，加入少量氢氧化钠溶液，用湿润的蓝色石蕊试纸接近试管口试纸变红溶液X中含有D将铁片插入稀硫酸中，一段时间后再往溶液中滴加少量溶液开始时有少量气泡产生，加入溶液后OSCAR THEATREBOOKING- in personThe Box Office is open Monday to Saturday, 10 am-8 pm.- by postStating the performance and choice of seats, enclosing a cheque, postal order, or your credit card details to Oscar Theatre Box Office, PO Box 220, Main street. All cheques should be made payable to Oscar Theatre.- by telephoneRing 0844 847 2484 to reserve your tickets or to pay by credit card (Visa, MasterCard accepted).- on-lineComplete the on-line booking form at www.oscartheatre.com.DISCOUNTSSaver: $2 off any seat booked any time in advance for performances from Monday to Thursday inclusive, and for all matinees(下午场). Savers are available for children up to 16 years old, over 60s and full-time students.Supersaver: half-price seats are available for people with disabilities and one companion. It is advisable to book in advance. There is a maximum of eight wheelchair spaces available and one wheelchair space will be held until one hour before the show (subject to availability).Standby: best available seats are on sale for $6 from one hour before the performance for people eligible(有资格的) for Saver and Supersaver discounts and thirty minutes before for all other customers.Group Bookings: there is a ten per cent discount for parties of twelve or more.Schools: school parties of ten or more can book $9 tickets in advance and will get every tenth ticket free.Please note: we are unable to exchange tickets or refund money unless a performance is cancelled due to unforeseen circumstances.小题1:How can you pay for a ticket when you book by post?A．By visiting the website of a post office.B．By going to you local bank in person.C．By enclosing your MasterCard in an envelope.D．By providing your credit card information.小题2:What benefit can bookers enjoy according to the text?A．A group of ten adults going to a performance can claim a discount.B．A school party of 15 persons that book in advance pay $135 in total for a performance.C．Someone accompanying a wheelchair user to a performance receives a discount.D．An 18-year-old teenager is eligible for Saver discounts.小题3:According to the text, who can get Standby tickets?A．Full-time students buying tickets 45 minutes before a performance begins.B．65-year-olds buying tickets an hour and a half before a performance begins.C．Theatre-goers who are unexpectedly unable to be present at a performance.D．Anyone who buys tickets an hour before a performance begins.