题目

下列实验方案中，不能达到实验目的的是( ) 选项实验目的实验方案 A检验CH3CH2Br在NaOH溶液中是否发生水解将CH3CH2Br与NaOH溶液共热。冷却后，取出上层水溶液，用稀HNO3酸化，加入AgNO3溶液，观察是否产生淡黄色沉淀 B检验Fe(NO3)2晶体是否已氧化变质将Fe(NO3)2样品溶于稀H2SO4后，滴加KSCN溶液，观察溶液是否变红 C验证Br2的氧化性强于I2将少量溴水加入KI溶液中，再加入CCl4，振荡，静置，可观察到下层液体呈紫色 D验证Fe(OH)3的溶解度小于Mg(OH)2将FeCl3溶液加 完形填空，阅读下面短文，掌握其大意，选择一个最佳答案。 　　Mrs Wang lives in Nanjing now．She is 102 years old．People often ask her how she can keep 　　1　　 in her life．Mrs Wang says everyone can 　　2　　 to 102 if he eats healthy food and does some exercise every day． 　　Mrs wang thinks, first of all, 　　3　　 is very important．She often has a glass of 　　4　　 and two eggs for it at about 8∶00 a．m．Milk and eggs give her energy．So she doesn't often feel 　　5　　 in the morning．She 　　6　　 eats snacks because she doesn't think they are healthy food．She seldom eats meat too．She usually has some 　　7　　 and vegetables for lunch and supper．And 　　8　　 the meal, she usually has an apple or a banana． 　　Mrs Wang does some exercise too．She thinks she is still young．She 　　9　　 Taiji for an hour every day．Sometimes she also dances with her friends．“Do you want to be 　　10　　 forever(永远)? I'm sure you can if you have a good lifestyle! ” Mrs Wang says to us． (1) [　　] A． quiet B． tidy C． friendly D． healthy (2) [　　] A． live B． die C． appear D． learn (3) [　　] A． lunch B． breakfast C． supper D． dinner (4) [　　] A． water B． juice C． milk D． lemon (5) [　　] A． tired B． pleased C． bored D． excited (6) [　　] A． often B． usually C． always D． never (7) [　　] A． pork B． rice C． beef D． meat (8) [　　] A． beside B． before C． behind D． between (9) [　　] A． makes B． shares C． prepares D． plays (10) [　　] A． young B． old C． luck D． hungry