George and Margaret and their children 21 at 140 Davis Street,22 the street from a small park．Their house is just off the main road．George usually goes to work by bus, but sometimes he goes 23 his car．The children usually go to school by bus．
The Glenns' house is 24 hidden among the trees．It has small bushes (灌木) planted around it．There is a fence 25 it and the house next door．It is a two-storey house, 26 the living room,dining room and kitchen(厨房) on the first floor,and the bedrooms and bathroom on the second floor．
The Glenns spend a lot of time at home． 27 now they are at dinner．Conversation (谈话) at the Glenns' house is usually lively at mealtime．The children are discussing trips they would like to take．
Susan,who has never 28 on a plane,says,"I'd like to 29 a plane to California．" Henry,who is elder,thinks it would be fun to be on a 30 ,heading for adventure(冒险) in Africa．Teddy,the youngest
child, says,"I want to go around the world on a train．" His elder brother and sister are still trying to 31 to him why this is not possible． 32 their mother says, "Children, you' ve spent too much time at the table．Henry and Susan, go and 33 your homework．Teddy,it' s time you were in bed．"
Soon there is silence throughout the 34 ．Teddy is in bed, Susan and Henry are in their rooms studying,and Mr．and Mrs．Glenns are in their living room, 35 George is sitting in his favorite(最喜欢的) chair,reading the paper and Margaret is sitting on the sofa,doing some sewing．
第（30）题答案
推理判断题。本段讲述孩子们想旅游的方式。Susan想坐飞机，Teddy想坐火车，Henry想坐船去非洲。
把10gMgCl2和MgSO4的混合物溶于适量水中，滴加2mol／L的BaCl2溶液至沉淀完全，共消耗BaCl2溶液25mL。求混合物中MgCl2和MgSO4的质量各是多少克
固定在匀强磁场中的正方形导线框abcd，各边长为1．其中ab是一段电阻为R的均匀电阻丝，其余3边均为电阻可忽略的铜线。磁场的磁感应强度为B，方向垂直纸面向里。现有一与ab段的材料、粗细、长度都相同的电阻丝PQ架在导体框上，如图所示。PQ以恒定速度方向如何
一小物块以速度v0=10m／s沿光滑地面滑行，然后沿光滑曲面上升到顶部水平的高台上，并由高台上飞出，如图所示。问当高台的高度h多大时，小物块飞行的水平距离最大这个距离是多少(g=10m／s2)
某晶体盐的水溶液呈浅绿色，在此溶液中通入氯气，溶液变为棕黄色，把所得棕黄色溶液分成两份：一份加入KSCN溶液，溶液变深红色；另一份加入BaCl2溶液，产生不溶于稀HNO3的白色沉淀，则该晶体盐的化学式是_______。
欲除去乙烷中的乙烯，可将混合气体通过盛有_______的洗气瓶；欲除去乙炔中的硫化氢，可将混合气体通过盛有_______的洗气瓶。
浓硝酸常盛装在棕色瓶中，且贮放在冷暗处，原因是_______，
碳酸氢钠溶液和烧碱溶液反应的离子方程式为_______。
常温下，氨水中存在的离子有_______。
在酸或碱存在的条件下，甲酸甲酯跟水发生水解反应的化学方程式为_______。
有下列几种气体：H2、O2、HCl、NO、NH3、CH4，其中通常情况下能用来和水做“喷泉”实验的是_______。
