简述我国营业税的改革和发展。

阅读下面一段文字，回答文后问题。

加拿大某公司建造了一座示范厂，用酒精而不是用硫磺造纸浆。该公司董事长佩蒂说：“这是未来之路。用酒精制造纸浆意味着出现一种清洁、无污染的技术。”

如果在小规模工厂里取得成功的这项技术也能在正式规模的工厂里生产出较便宜的纸浆，它将对纸价产生影响。这项技术还能消除造纸工业常有的臭鸡蛋味 ——硫化氢的气味。

该公司使用的这种工艺叫ALCELL(即酒精ALCOHOL和纤维素CELLULOSE的合成词)，它使用酒精和水代替硫磺把木材分解成纸浆。这种工艺是加拿大在1972年发明的，以前从来没有实现商品化，但是这家公司希望它能使造纸工业发生彻底变革。

佩蒂说：“建造一座新的纸浆厂要耗资10亿美元，而且它要求木材供应源源不断。如有ALCELL工艺，只要耗资3.5亿美元就能建造一个工厂，并使工厂不停地运转，所需木材供应量较小。”他又说：“那意味着一个工厂一天生产350吨而不是1000吨纸浆。”林业产品分析家邓肯森说：“从环境方面来说，它比较清洁，而且小型厂这个概念将会使建造新纸浆厂变得较容易。”这种工艺取得成功，它将能以较低的成本生产纸浆。

第四段中，佩蒂说“一天生产350吨而不是1000吨纸浆”，他要说明的是（）。

A．纸厂规模的缩小

B．纸张成本的降低

C．生产流程的简化

D．纸浆产量的减少

阅读短文，根据其内容用括号内所给动词的适当形式填写。

     Mr. Anderson works as a headmaster in a middle school. His father 1._____(have) a factory in a

town and makes a lot of money. Mr. Anderson's father loves his son very much and gives his son

everything he wants. However, Mr. Anderson keep 2.______(try) to save everything he can.

    One summer it was raining hard for a long time and many people 3______ (lose) their houses and

farms during a flood. The government asked people to help those who 4_______(be) in trouble. As a

headmaster, Mr. Anderson told the whole school 5_______ (collect) money for the people who had

lost their homes.

    "Each of us should 6______(help) the farmers who are in trouble after the flood," he said at a school

meeting.

     Mr. Anderson's speech moved all the teachers and the students. They 7______(do) their best to

help the hungry people with money and goods. Mr. Anderson was very pleased with the result.

As soon as he 8______(get) home that afternoon, his little son asked Mr. Anderson to buy him a new

motorbike. The little boy had given his old one to the people in need.

     "How dare you do that?" Mr. Anderson said angrily.

     "You told us to collect money this morning, 9______(not, do) you?

     "Yes, I did," 10______(say) the father. "But I was asking for other children, not for you!"

直流电疗法由阴极导入的药物离子为（）

A.维生素B1

B.钙

C.透明质酸酶

D.锌

E.碘

下列不是按空气处理设备的设置情况进行分类的空调系统的是( )。

A．全分散系统
B．半集中系统
C．全空气系统
D．集中系统