问题 选择题

下列化学过程及其表述正确的是

A.向NaHSO4溶液中滴入Ba(OH)2溶液至中性

B.由水电离的c(H)为l0mol的溶液中,Na、NO3、SO32、Cl定能大量共存

C.酸碱中和滴定时,盛装标准液的滴定管滴定前无气泡,终点读数时有气泡,导致计算结果偏低

D.可以用浓盐酸酸化的KMnO4溶液与H2O2混合,以证明H2O2具有还原性

答案

答案:C

题目分析:A.向NaHSO4溶液中滴入Ba(OH)2溶液至中性,反应的离子方程式是:2H+ SO42-+ Ba2++2OH-==BaSO4↓+2H2O。错误。B.由水电离的c(H)为l0-3 mol/L的溶液,水的电离受到了促进。可能是强酸弱碱盐,也可能是强碱弱酸盐溶液。在强酸弱碱盐溶液中SO32不能大量共存。错误。C.酸碱中和滴定时,盛装标准液的滴定管滴定前无气泡,终点读数时有气泡,消耗的标准溶液体积读数偏小,以此为标准计算的碱溶液的浓度就偏低。正确。D.由于浓盐酸有还原性,所以酸化高锰酸钾溶液要用硫酸来酸化,然后溶液与H2O2混合,以证明H2O2具有还原性。错误。

阅读理解

A little girl lived in a small, very simple, poor house on a hill and as she grew she would play in the small garden. There, she was able to see over the garden fence and across the valley to a wonderful house high on the hill. This house had golden windows, so golden and shining that the little girl would dream of how magic it would be to grow up and live in a house with golden windows instead of an ordinary house like hers. Although she loved her parents and her family, she yearned to live in such a golden house and dreamed all day about how wonderful and exciting it must feel to live there.

When she got to an age when she gained enough skill and sensibility to go outside her garden fence, she asked her mother if she could go for a bike ride outside the gate and down the lane. After pleading with her, her mother finally allowed her to go, insisting that she should keep close to the house and not wander too far. The day was beautiful and the little girl knew exactly where she was heading! Down the lane and across the valley, she rode her bike until she got to the gate of the golden house across on the other hill.

As she dismounted her bike and leaned it against the gate post, she focused on the path that led to the house and then on the house itself. She was so disappointed as she realized all the windows were plain and rather dirty, reflecting nothing other than the sad neglect of the house that was derelict.

So sad she didn't go any further and turned, and heart broken as she remounted her bike. As she glanced up she saw a sight to amaze her. There across the way on her side of the valley was a little house and its windows glistened golden as the sun shone on her little home.

She realized that she had been living in her golden house and all the love and care she found there was what made her home the 'golden house'. Everything she dreamed was right there in front ofher nose!

小题1:Why did the girl long for the house on the hill?

A. Because there was a small garden.

B.Because it’s magic.

C. Because it’s ordinary.

D.Because its windows looked golden.小题2:Which  statement is True according to Paragraph 2 and 3?

A. The girl’s mother finally allowed her to go to the golden house alone.

B. The golden house was on the hill where the girl lived.

C.What disappointed the little girl was that the house was locked.

D.Actually , the windows of the golden house were common and covered with dirt.小题3:What amazed the girl was that_____

A. Her home was another golden house

B. There was no golden house indeed

C. She could see the golden house only when she looked up

D. The golden house disappeared when the sun shone on it小题4:What can be inferred from the passage?

A. The mother thought that she needn’t keep an eye on her daughter.

B. The girl was determined to go to the golden house at the beginning.

C. The girl had no idea where she was heading after leaving home.

D. The girl didn’t love or care for her parents .小题5:The passage is intended to tell us that_____.

A. girls often have amazing imagination

B.not all dreams will come true

C. what we dream of may be just around us

D.nothing is impossible to a willing heart

单项选择题