题目

Three-day Tour Arrangement to Cambodia(柬埔寨)Day 1Welcome to Cambodia! Upon arrival, our professional guide and driver will greet you at the airport, and take you to check in at the hotel. The rest of the day is free for you to explore the city.Meals: No meals, advice freely availableAccommodation: Tara Angkor (吴哥窟) HotelDay 2Angkor Thom (大吴哥窟) is regarded as the heart of Angkorian relics of Cambodia. After breakfast, we will head for this ancient capital to enjoy the wonderful carvings and sculptures (雕塑) at the south gate.After that, follow our guide to tour Angkor 在BaCl2溶液中通入SO2气体,溶液仍澄清;若将BaCl2溶液分盛两支试管,一支加硝酸,另一支加烧碱溶液,然后再通入SO2气体,结果两支试管都有白色沉淀.由此得出下列结论合理的是 [     ]A.氯化钡显两性 B.两支试管中生成的沉淀都是BaSO4C.两支试管中的沉淀都是BaSO3 D.H2SO3可被HNO3氧化为H2SO4,BaCl2与SO2不反应,但能与SO32-反应
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