（1）下图是一套实验室制取气体的装置，用于发生、干燥和收集气_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题实验题

（1）下图是一套实验室制取气体的装置，用于发生、干燥和收集气体。下列各组物质中能用这套装置进行实验的是_____________（填编号）。

A．MnO₂和浓盐酸

B．Zn和稀硫酸

C．MnO₂和H₂O₂

D．CaCO₃和盐酸（2）将过氧化氢溶液滴入含有酚酞的氢氧化钠溶液中，红色消失。甲同学认为这是因为过氧化氢是二元弱酸（H₂O₂H⁺+）消耗了OH^-，而使酚酞褪色；乙同学认为，过氧化氢具有强氧化性，将酚酞氧化，红色消失。试设计一个简单易行的实验验证甲、乙两同学的解释哪个正确。

（3）久置的油画的白色部位（化学成分为PbSO₄）常会变黑（化学成分为PbS），用双氧水擦拭后又可恢复原貌，则发生反应的化学方程式为____________________________。

答案

（1）CD （2）向褪色后的溶液中加入过量的氢氧化钠溶液，如果溶液重新变红，则甲同学的解释正确；如果溶液不变红，则乙同学的解释正确

（3）PbS+4H₂O₂====PbSO₄↓+4H₂O

（1）MnO₂和浓盐酸反应制Cl₂需加热，Zn和稀H₂SO₄反应制H₂，应用向下排空气法收集，因此A、B不能用此装置进行实验。

（2）甲同学认为是因为H₂O₂消耗了OH^-，使酚酞褪色，那么补充大量的OH^-，看溶液是否又变红，可证明甲观点是否正确。

完形填空

“You will never walk again．You will have to use a wheelchair．” I heard his   36  fall heavily on my ears, numbing my soul．If I had never felt hopeless before, I felt hopeless then．
The car accident has left me unconscious．When   37  , I found both legs in casts（石膏）．While I had other serious injuries, my    38  were my first concern．Working as a special needs teacher and busy and active by nature, I couldn’t imagine being   39  in a wheelchair．
Lying in my bed, I wondered how I   40  give my ten-year-old son hope that mom would 41 ．He’d been cheerful on every visit, but I saw    42  in his eyes． He needed the ray of hope that I would not be in a wheelchair forever．
Just maybe, I thought, I could use this experience to teach him what to do when misfortune 43 ．
It didn’t take me long to become 44 with my limited movements and even with the pace the doctors were willing to go with me．I was determined to learn everything they showed me．
Every night in my private room, as soon as I knew I wouldn’t be   45 or discovered, I would move myself from the bed to the floor, 46  on to the bed rail（床栏杆） for dear life, and slowly putting my weight   47  my feet．After several weeks of such difficult   48 , my strength and confidence continued to    49  ．
It came the time to share my accomplishments with the person most    50   to me．One night, when I heard my son greet the nurses at the station, I    51  myself up．As he opened the door, I took a few small steps．   52  , he could only watch as I turned and started back to bed．All of the pain, the fear, and the struggle   53 as I heard the words I had longed to hear, “Mommy, you can walk!”
I am now able to walk alone, sometimes using a stick．I am able to take public transportation to shop and visit friends．My life has been blessed with many   54 of which I am proud．But none has ever brought me the satisfaction and joy   55  by those four little words of my son．

C．explanations

D．surroundings

C．discouraged

B．interrupted

A．Disappointed

B．Embarrassed

A．expectation

C．achievements

单项选择题 B1型题

稽留流产（）

A.停经后少量 * * 流血，轻微下腹痛，宫口未开，胎膜未破

B.停经后多量 * * 流血，下腹阵发性剧痛，宫口开大，胎膜已破

C.停经后多量 * * 流血，有肉样组织排出，子宫小于停经周数，宫口开大，体温增高

D.停经后出现反复 * * 流血，子宫明显小于停经周数，尿妊娠试验阴性

E.停经3月，子宫如孕40天大小