问题 阅读理解

阅读理解。

     Grandma Moses is among the most famous twentieth-century painters of the United States, yet she did

not start painting until she was in her late seventies. As she once said of herself:"I would never sit back in

a rocking chair, waiting for someone to help me." No one could have had a more productive old age.

     She was born Anna Mary Robertson on a farm in New York State, one of five boys and five girls. At

twelve she left home and was in domestic (家庭的) service until, at twenty-seven, she married Thomas

Moses, the hired hand of one of her employers. They farmed most of their lives, first in Virginia and then in

New York State, at Eagle Bridge. She had ten children, of whom five survived; her husband died in 1927.

     Grandma Moses painted a little as a child and made embroidery (刺绣) pictures as a hobby, but only

changed to oils in old age because her hands had become too stiff (硬的) to sew and she wanted to keep

busy and pass the time. Her pictures were first sold at a local market and were soon noticed by a businessman

who bought everything she painted. Three of the pictures exhibited in the Museum of Modern Art, and in

1940 she had her first exhibition in New York. Between the 1930s and her death she produced some 2,000

pictures: detailed and lively portrayals (描绘) of the country life she had known for so long, with a wonderful

sense of colour and form. "I think really hard till I think of something really pretty, and then I paint it." she

said.

1. According to the passage, Grandma Moses began to paint because she wanted to _____. [ ]

A. make herself beautiful

B. keep active

C. earn more money

D. become famous

2. The underlined word "survived" means _____. [ ]

A. graduated from college

B. examined the condition of the house

C. lived longer than the other children

D. gave up themselves to the police

3. From Grandma Moses' description of herself in the first paragraph, it can be inferred that she was _____. [ ]

A. independent

B. pretty

C. rich

D. nervous

4. Which of the following would be the best title for the passage? [ ]

A. Grandma Moses: Her Life and Pictures.

B. The Children of Grandma Moses.

C. Grandma Moses: Her Best Exhibition.

D. Grandma Moses and Other Older Artists.

答案

1-4: BCAA

填空题

单质硅是很重要的工业产品。

(1)硅用于冶炼镁,也称硅热法炼镁。根据下列条件:

Mg(s)+ 1/2O2(g)= MgO(s)  △H1=-601.8 kJ/mol

Mg(s)= Mg(g)                △H2=+75 kJ/mol

Si(s) + O2(g) = SiO2(s)   △H3= -859.4 kJ/mol

则2MgO(s)+ Si(s)= SiO2(s)+ 2Mg(g)  △H =        

Mg-NiOOH水激活电池是鱼雷的常用电池,电池总反应是:Mg+2NiOOH+2H2O=Mg(OH)2+ 2Ni(OH)2,写出电池正极的电极反应式                       

(2)制备多晶硅(硅单质的一种)的副产物主要是SiCl4,SiCl4对环境污染很大,遇水强烈水解,放出大量的热。研究人员利用SiCl4和钡矿粉(主要成分为BaCO3,且含有Fe3+、Mg2+等离子)制备BaCl2·2H2O和SiO2等物质。工艺流程如下:

已知: 25℃ Ksp[Fe(OH)3]=4.0×10-38, Ksp[Mg(OH)2]=1.8×10-11;通常认为残留在溶液中的离子浓度小于1×10-5mol/L时,沉淀就达完全。回答下列问题:

①SiCl4发生水解反应的化学方程式为_______________________________________。

②若加钡矿粉调节pH=3时,溶液中c(Fe3+)=             

③若用10吨含78% BaCO3的钡矿粉,最终得到8.4吨BaCl2·2H2O (M=244g/mol),则产率为      

④滤渣C能分别溶于浓度均为3mol/L的溶液和溶液(中性)。请结合平衡原理和必要的文字解释滤渣C能溶于3mol/L的溶液的原因______。

填空题