题目

根据下列实验操作和现象所得出的结论都正确的是( ) 选项实验操作与现象结论 A苯中混有苯酚，可以加足量浓溴水，过滤除去苯酚三溴苯酚是白色沉淀 B蔗糖溶液在稀硫酸存在下水浴加热一段时间后，加适量氨水使溶液为碱性，再与银氨溶液混合加热，有光亮的银镜生成蔗糖溶液已经水解完全 C向溶液X中滴入新制氢氧化铜浊液，加热，产生红色沉淀X中的溶质一定是醛 D苯中混有苯甲酸，可以通过加生石灰使苯甲酸生成苯甲酸盐，再蒸馏提取苯。苯与苯May : Happenings from the past  May 5,1884 Isaac Murphy , son of a slave and perhaps the greatest horse rider in American history , rides Buchanan to win his first Kentucky Derby . He becomes the first rider ever to win the race three times .May 9 , 1754 Benjamin Franklin’s Pennsylvania Gazette produces perhaps the first American political cartoon （漫画）, showing a snake cut in pieces, with the words “ Join or Die” printed under the picture.May 11,1934The first great dust storm of the Great Plains Dust Bowl , the result of years of drought（干旱），blows topsoil all the way to New York City and Washington , D.C. .May 19, 1994 Jacqueline Lee Bouvier Kennedy Onassis , former first lady and one of the most famous people of the 1960s , died of cancer in New York City at the age of 64 .May 24, 1844Samuel F.B. Morsr taps out the first message , “ What Hath God Wrought ,” over the experimental long-distance telegraph line which runs from Washington, D.C. , to Baltimeore , Md . 1. We know from the text that Buchanan is_____________.A Isaac”s father                 B a winnning horse C.a slave taking care if horses      D.the first racing horse in Kentucky2. What is the title of the first American political cartoon ?A.Join or Die                   B.Pennsylvania GazetteC.What Hath God Wrought        D.Kentucky Derby 3. In which year did the former first lady Jacqueline die ?A. 1934        B. 1960       C . 1964       D. 19944.Which of the following places has to do with the first telegram in history ?A. Washington , D. C.             B. New York City C. Kentucky.                    D.  Pennsylvania