某商品流通企业既经营生产资料又经营生活资料，经营的商品主要有_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

某商品流通企业既经营生产资料又经营生活资料，经营的商品主要有汽车、钢材、水泥、轮胎、空调、彩电、电脑、服装、鞋、粮食、食盐、疏菜、牙膏、冷饮等。该企业经常根据商品的供求形态来选择预测方法，并对企业经营的商品进行预测。

该企业近11年的汽车销售量如下表所示。

时间(年)	1	2	3	4	5	6	7	8	9	10	11	12
实际销售量(辆)	450	500	550	540	570	600	630	670	690	720	750

运用一次指数平滑法预测，已知第11年的销售量预测值F₁₁=740，取a=0.8，则第12年的销售量预测值为( )辆。

A．738

B．748

C．750

D．758

答案

参考答案：B

解析：8×750+(1-0.8)×740=748辆。

问答题

材料是人类生存和发展的基础，合理使用材料可改善人类的生活．

（1）钢铁在酸雨中会发生电化学腐蚀，其负极电极反应式是______；为防止轮船的船体在海水中腐蚀，一般在轮船身上装有一定数量的______．

（2）居室装修所使的人造板材会释放出一种挥发性物质，长期接触会引起过敏性皮炎，免疫功能异常，该挥发性物质是______（填名称）．

（3）铁是人们生活中常用的金属材料，请列举两种常用的防止铁制品被腐蚀的方法：______，______．

（4）石英玻璃化学稳定性强、膨胀系数小，是一种特种玻璃，石英玻璃的主要成分是______；有机玻璃（聚甲基丙烯酸甲酯）实际上不是硅酸盐材料，而是一种______．（选填“橡胶”或“纤维”或“塑料”）

（5）玻璃是重要的硅酸盐产品．生产玻璃时，石灰石与石英反应的化学方程式为______．

完形填空

完形填空（共20小题，每小题1.5分，满分30分）
阅读下面短文，掌握其大意，然后从36---55所给的四个选项（A、B、C、D）中，选出最佳选项。
The first day of school our professor introduced himself and challenged us to get to know a new classmate. I stood up to 36 when a gentle hand 37 my shoulder. I turned around to find a wrinkled, little old lady looking up at me with a 38 .
She said, “Hi. My name is Rose. I’m eighty-seven years old. Can I give you a 39 ?” I laughed and enthusiastically responded, “Of course you may!” and she gave me a giant squeeze (an act of pressing).
“Why are y

ou in college at such a young,    40  age ?”I asked. “I always dreamed of having a  41   experience and now I’m getting   42 !” she told me.
Later, we became close friends. Every day we would leave class together and she   43   her wisdom and  44   with me. Over the course of the year, Rose became a (an)    45  icon（偶像） and she easily made friends wherever she went.
At the 46 of the term we invited Rose to speak at our football banquet. I’ll never forget what she taught us. When she was  47  , frustrated and a little embarrassed, she cleared her 48 and said, “We do not stop playing because we are old; we 49 old because we stop playing. There are only two secrets to staying   50 , being happy, and achieving success. You have to laugh and find 51   every day. You’ve got to have a dream. When you lose your dreams, you  52  .”
One week after graduation Rose died   53   in her sleep. Many college students attended her funeral in tribute to（悼念）the wonderful woman who taught us by    54  that it’s never too late to 55  all you can possibly be.

A．look around

B．junior high school

C．senior high school

D．primary school

小题8: A. shared B. told C

. learned D. debated

C．fortunately