题目

如图所示，电源电压恒定不变，小灯泡L上标有“6V•3W”字样，滑动变阻器R最大阻值36Ω，灯泡电阻不随温度变化．闭合S、S1、S2，当滑动变阻器滑片位于最右端时，电压表示数为3V；闭合S、S1，断开S2，当滑动变阻器滑片位于最左端时，灯泡正常发光. 求：               ⑴电源电压；                                                                                                              �·Paris City Tour, Seine River Cruise（巡游）and the Eiffel Tower Duration: 5 hours Departure Dates: Daily Unavailable Date: July 14 (Bastille Day) Departure Point: Paris Departure Time: 9:00 am, 12:00 pm, 3:00 pm This tour will give you a view of Paris from three different viewpoints. It includes a coach tour around Paris with a Seine River cruise, which will take you back through 2,000 years of Paris history. The tour concludes with an elevator ride up to the 2nd floor of the Eiffel Tower, where you can experience its wonderful view. ·London City Tour, Thames River Cruise and English Pub Lunch Duration: 8.5-9 hours Departure Dates: Daily Unavailable dates: January 1 (New Year’s Day), December 24-26 (Christmas) Departure Point: Victoria Coach Station, opposite Gate 1 Departure Time : 8:45 am You will visit great architecture like Westminster Abbey, the Big Ben, the Houses of Parliament, and the Buckingham Palace. The tour includes 38 ceremonies and 14 Royal weddings. At noon, you’ll have two-course lunch in a traditional London puB．After lunch, there will be a Thames River Cruise for great views of the Houses of Parliament, London. ·Full Day Tour to Naples and Pompeii Duration : 13 hours Departure Dates: Daily Unavailable Dates: New Year’ Day, Christmas Day, December 31 Departure Point: Rome Hotel Departure Time:6 :30 am Take the “Highway of the Sun” and travel through the Roman countryside. Arriving in Naples, you will go on along the hill of Posillipo, where you can enjoy views of the volcano Vesuvius which erupted in AD 79, destroying the towns of Pompeii. At Pompeii you will stop for lunch. After lunch, visit the site for two hours with a local guide, traveling through the ruins of this ancient city. Then return to the coach for a journey of 3 hours back to Rome. 1．If you have a holiday on New Year’s Day, you can choose         .        A．Paris City Tour                                    B．London City Tour        C．Roman City Tour D．Pompeii City Tour 2．This passage is most likely to be found in         .        A．a technical report B．a science magazine        C．a local newspaper D．a history book 3．We can learn from the passage that         .        A．Seine River Cruise will take you back through 2,000 years of European history        B．English Pub Lunch will give you a chance to see a traditional London pub        C．tourists can enjoy views of the volcano Vesuvius erupting in Pompeii        D．the journey back to Rome will take about four hours 4．The main purpose in writing this passage is to         .        A．attract more tourists to Rome        B．introduce three tourist tracks in Europe        C．show some ancient tourist attractions        D．make European culture better known