问题 填空题

汽车尾气(含碳氢化合物、CO、S02、NO等物质)是城市空气的污染源.合理的方法之一是在汽车的排气管上装一个“催化剂转换器”(内含催化剂),它的特点之一是使CO与NO反应,生成可参与大气生态环境循环的无毒气体.

(1)写出C0与N0反应的化学方程式:______.

(2)下列方法中,你认为也能控制城市空气污染的是______(填字母代号)

A.开发新能源;B.使用电动车;C.植树造林;D.戴上防毒面具

答案

(1)CO与NO反应,生成可参与大气生态环境循环的无毒气体.

根据空气的组成成分和质量守恒定律中元素种类不变的特点可知生成的无毒气体是二氧化碳和氮气.

因此催化转换器可使一氧化碳与一氧化氮在催化剂的催化作用下反应生成二氧化碳和氮气.

该反应的化学方程式为:2C0+2NO

 催化剂 
.
 
2CO2+N2

(2)在所提供的措施中,开发新型的清洁能源、使用电动车、植树造林这几项措施都可以防治空气污染,因此选A、B、C.

故答案为:

(1)2C0+2NO

 催化剂 
.
 
2CO2+N2

(2)A、B、C

单项选择题 A3型题
单项选择题

These are hard times for Deutsehe Bank, despite its huge strides in investment banking. Next week its chief executive, Josef Ackerman, goes on trial in Dusseldorf. Careless words by Rolf Breuer, the head of its supervisory board, led to another court ruling last month that may cost Germany’ s biggest bank several hundred million euros in damages. Then there is Parmalat. Although no evidence has emerged of complicity in the Italian dairy group’ s fraud, Deutsche’ s name has become entwined in the affair.

In many other respects, however, Deutsche’ s reputation has never been higher. In dubbing it " Bank of the Year 2003", International Financing Review, the capital markets’ favorite newssheet, purred that Deutsche was a "lean, aggressive, focused universal bank" In the league tables that investment banks watch so keenly, Deutsche excelled last year as lead manager of bonds and convertible bonds and of some racier products, such as repackaged debt securities and high-yield "junk" bonds. In other disciplines it rarely fell below the top ten in the world.

However, it is still nowhere near the top in equity offerings and advice on mergers and acquisitions, except in Germany. It still has a problem with costs,which were a fat 82% of income in the third quarter of 2003, thanks mainly to the thick pay packets of its investment bankers and its poor returns from corporate and retail banking.

Mr. Ackermann must try to improve the weak spots while spending two clays a week, probably until June, in a courtroom. He and four others face charges of "breach of trust" over the way bonuses were awarded to board meinbers of Mannesmann, a telecoms company. Mr. Aekermann sat on Mannesmann’ s supervisory board. There is no suggestion that he gained personally. Nor was there any harmful intent in Mr. Breuer’ s remarks in a television interview about the financial health of the Kirch media group shortly before its bankruptcy. But he was careless, and a Munich court found Deutsche (but not Mr. Breuer) liable for damages, to be set in due course, without right of appeal. The bank said this week it has lodged a protest with the federal supreme court in Karlsruhe. Meanwhile, Kirch has filed a suit against Deutsche in America.

Deutsche’s involvement with Parmalat also looks sloppy. It led a 350m bond issue fur the group in September. It was also a leading borrower and lender of Parma[at shares, so that in November it technically held the voting rights to over 5% of Parmalat stock. That stake had fallen to 1.5% by December 19th, the day the dairy company’s black hole became public. It reported this, perhaps over-zealously, to the Italian authorities. That may have given the wrong impression, say, sources close to the bank, because the transactions were for third parties.

This is awkward for a bank that managed to avoid most serious attacks on conflicts of interest thai beset the investment-banking industry following the collapse of Enron in 2001 and the bursting of the tech-stock bubble. Mr. Ackermann will need a clear head to steer the bank through the coming storms.

The best title for this passage is()

A. A Promising Future of Deutsche

B. Messy Banking Industry in Germany

C. Deutsche Possible Accomplice of Pamalafs Fraud

D. The Difficulties of German’ s Largest Bank