尺寸界线、尺寸线、引出线、剖面用（）.A.细实线 B.粗实线 C.点划线 D.虚线

（12分）(1)过氧化钠可用作于制氧剂，写出过氧化钠与二氧化碳反应的化学方程式                                         

(2)工业上制取漂白粉的化学方程式为______________         ______。漂白粉露置于空气中失效的原因是(用化学方程式表示)：

①________                                                  _，

②___________                                      ________。

Tom was a clever boy, but his parents were poor, so he had to work in his spare time and during his holidays to pay for his education. In spite of this, he managed to get to the university, but it was so expensive to study there that during the holiday he found it necessary to get two jobs at the same time so as to make enough money to pay for his studies.

One summer he managed to get a job in a butcher’s shop(肉店)during the day-time, and another in a hospital at night. In the shop, he learnt to cut meat quite nicely, so the butcher often left him to do all the serving while he went to the back room to do the accounts(账目). In the hospital , on the other hand, he was , of course , allowed to do the simplist jobs, like helping to lift people and to carry them from one part of the hospital to another. Both at the butcher’s shop and at the hospital, Tom had to wear white clothes.

One evening at the hospital, Tom had to carry a woman from her bed to the place where she was to have an operation. The woman was already feeling frightened at the thought of the operation before he came to get her, but when she saw Tom, that finished her.

“No! No!” she cried. “Not my butcher! I won’t be operated on by my butcher!” and fainted away(昏厥).

68. Tom made enough money by ________.

A. studying in the university         B. working in a butcher’s shop

C. doing two jobs                  D. cutting meat well

69. Tom was a student, but at the same time he was__________.

A. a butcher and a doctor           B. a manager and a doctor

C. an assistant                    D. a manager

70. The woman patient recognized Tom because ____________.

A. he was wearing white clothes    

B. he had sold meat to her

C. he was now working in the hospital  

D. he was going to operate on her

71. When she saw Tom, that finished her, the sight of Tom _________.

A. plunged her into deep sorrow  

B. made her decide not to have an operation

C. broke her heart        

D. took all her strength and courage away

The significantwords found on an old key —"If I rest, I will rust"—would be an excellent motto for those who are tired of their slightest bit of idleness

(懒散).

Those who would attain the heights reached and kept by great men must keep their abilities polished by constant use, so that they may unlock the doors of knowledge, the gates that guard the entrance to the professions, to science, art, literature, or agriculture —- every department of human efforts.

Industry(勤奋)　keeps bright the key that opens the treasury of achievement.

If Hugh Miller, after working hard all day in a mine, had devoted his evenings to rest and relaxation, he would never have become a famous geologist. The outstanding mathematician, Edmund Stone, would never have published a mathematical dictionary, never have found the key to the science of mathematics, if he had given his spare moments to idleness. Had the little Scottish boy, Ferguson, allowed his busy brain to go to sleep while he tended sheep on the hillside instead of calculating the positions of the stars by a string of beads, he would never have become a famous astronomer.

[写作内容]

1.以约30个词概括以上短文的内容要点；

2.以约120个词就“业精于勤荒于嬉”这一主题进行议论，内容包括：

（1）文章对你的启示；

（2）描述你自己或他人通过勤奋取得成功的事例。

[写作要求]

1.可以使用亲身经历或虚构的故事，也可以参照阅读材料的内容，但不得直接引用原文中的句子。

2.作文中不能出现真实姓名和学校名称。

[评分标准]

概括准确，语言规范，内容合适，语篇连贯。

根据合作伙伴在供应链中的增值作用和他的竞争实力，合作伙伴分为四类，其中竞争力和增值作用多很大的合作伙伴是（）

A、战略性合作伙伴

B、普通合作伙伴

C、有影响力的合作伙伴

D、竞争性/技术性合作伙伴

黄河入海水量1951年大约为500亿立方米，2010年大约为140亿立方米，总体呈下降趋势，据材料完成下列各题。

黄河入海水量减少带来的主要影响是（）

A、三角洲土壤盐渍化减轻

B、三角洲扩展速度减慢

C、入海口河水含沙量增加

D、河口地区的气候变干