间隙式扩散

铁是人体不可缺少的微量元素，摄入含铁的化合物可补充铁。“速力菲”是市场上一种常见的补铁药品，下表是说明书的部分内容。

[规格]每片含琥珀酸亚铁 [适应症]用于缺铁性贫血症，预防及治疗用。 [用量用法]成人预防量/日，成人治疗量—/日。 小儿用量预防量— /日，治疗量—/日 [贮藏]避光、密封、在干燥处保存。

（1）该药品中Fe²⁺会缓慢氧化。国家规定该药物中Fe²⁺的氧化率（已经被氧化Fe²⁺的质量与Fe²⁺总质量的比值）超过10.00% 即不能再服用。

①实验室可采用H₂SO₄酸化的KMnO₄溶液，对“速力菲”中的Fe²⁺进行滴定(假设药品中其他成份不与KMnO₄反应)。请写出该反应的离子方程式：                                  。

②实验前，首先要精确配制一定物质的量浓度的KMnO₄溶液250 mL，配制时需要的玻璃仪器除玻璃棒、烧杯、胶头滴管外，还需          。

③某同学设计了下列滴定方式（夹持部分略去），最合理的是       。（填字母序号）

（2）称量上述含铁元素质量分数为20.00%的“速力菲”10.00 g，将其全部溶于稀H₂SO₄中，配制成1000 ml溶液，取出20.00 ml，用0.01000 mol•L^-1的KMnO₄溶液滴定，用去KMnO₄溶液12.00 ml ，该药品中Fe²⁺的氧化率为                 。

（3）已知琥珀酸为二元有机羧酸，含23.6 g琥珀酸的溶液与4.0 mol•L^-1 100.0 ml的氢氧化钠溶液恰好完全中和。核磁共振氢谱分析显示，琥珀酸分子谱图上只有两组吸收峰。写出琥珀酸溶液与氢氧化钠溶液完全中和的化学方程式(有机物写结构简式)                                        。

阅读理解。

     It was a warm April day when a big fat envelope came in the mail from the only college I had ever

imagined attending. I tore open the packet. My eyes were fixed on the word "congratulations". I don't

remember ever smiling so wide.

     Then I looked at my rinancial package.

     The cost of Dream School's tuition, room and board was around  $ 40,OOO-an impossible sum !

How could I afford to attend? What good reasons did I have to go there when three other fine colleges were offering me free tuition? My other choices were good, solid schools even if they weren't as famous as my first choice.

     In my mind, attending my dream university would be the only way to realize my dream of becoming a

world-class writer. My parents understood how l felt. They told me that even though it would be a financial problem, I could go wherever I would be happiest. But as I was always careful with money, l wasn't sure what to do.

      One of the schools that offered me a full ride had an informational dinner one night in the spring.

Considering my parents' financial difficulties, l decided to drive the 45 minutes and attend. At first, all I had planned to do was smile politely, eat free food, listen quietly. But I surprised myself.

      At dinner the president of the university talked about the wonderful activities on campus including guest lectures and social gatherings. He also made it perfectly clear that free food would be offered at all future

events. He continued with explanations of professors, class sizes, activities, and sporting events on

campus.  As he spoke, I began to realize that this school, though not as good as my first choice, might be

the best one for me. It seemed small yet with many great programs. It seemed challenging yet caring.

      As the president ended his speech, we clapped politely and pushed back our chain.  As I walked out

of that door, a feeling of comfort washed over me. Looking at the campus that night, l realized that I would be spending the next four years fighting there.

        In all honesty, my university is not as well-known as my " dream"  university.  However, it turned out

to be the right choice of schools for me.

1. How did the author feel when he started to read the letter?

A.  He was full of joy.                      

B.  He was lost in his dream.

C. He was worried about the money.      

D. He was uncertain which school to go to.

2. We can learn from the passage that the parents were _____. 

A. honest      

B. strict          

C. supportive        

D. decisive

3.  In Paragraph 5, " offered me a full ride"  can be replaced by " _____".

A. would pay for transport to the school          

B. would show me around the campus

C. would offer free meals at all events      

D. would charge me nothing for tuition

4. What does the author mainly want to say?

A. Your second-choice college may actually be your best fit.

B. You should consider comfort in your choice of schools.

C. You should try your best to attend your dream school.

D. Your choice of schools should be based on their fame.

设备制造的质量控制方式有（）。

A.驻厂监造

B.巡回监控

C.就地监造

D.远程监控

E.定点监控

下列4种存储器中，存取速度最快的是

A．磁带

B．软盘

C．硬盘

D．内存储器

试述太平天国运动的历史意义及其失败的教训。