问题 阅读理解

阅读理解。

     The most frightening words in the English language are, "Our computer is down." You hear it more

and more when you are on business. The other day I was at the airport waiting for a ticket to

Washington and the girl in the ticket office said, "I'm sorry, I can't sell you a ticket. Our computer is

down."

     "If your computer is down, just write me out a ticket."

     "I can't write you out a ticket. The computer is the only one allowed to do so."

     I  looked down on the computer and every passenger was just standing there drinking coffee and

staring at the black screen. Then I asked her, "What do all you people do?"

     "We give the computer the information about your trip, and then it tells us whether you can fly with

us or not."

     So when it goes down, you go down with it."

     "That's good, sir."

     "How long will the computer be down?" I wanted to know.

     "I have no idea. Sometimes it's down for 10 minutes, sometimes for two hours. There's no way we

can find out without asking the computer, and since it's down it won't answer us."

      After the girl told me they had no backup (备用) computer, I said. "Let's forget the computer. What

about your planes? They're still flying, aren't they?"

     "I couldn't tell without asking the computer."

     "Maybe I could just go to the gate and ask the pilot if he's flying to Washington, " I suggested.

     " I wouldn't know what gate to send you to. Even if the pilot was going to Washington, he couldn't

take you if you didn't have a ticket."

     "Is there any other airline flying to Washington within the next few hours?"

     "I wouldn't know, " she said, pointing at the dark screen. "Only 'IT' knows. 'It' can't tell me."

     By this time there were quite a few people standing in lines. The word soon spread to other travelers

that the computer was down. Some people went white, some people started to cry and still others kicked

their luggage.

1.  The best title for the article is _______.

A. When the Computer Is Down            

B. The Most Frightening Words

C. The Computer of the Airport          

D. Asking the Computer

2.  What could the girl in the ticket office do for the passengers without asking the computer?

A. She could sell a ticket.    

B. She could write out a ticket.

C. She could answer the passengers' questions.

D. She could do nothing.

3.  Why do you think they had not a backup computer?

A. Because it was easy down              

B. Because it was very expensive.

C. Because it was not advanced enough.

D. Because it was not as big as the main computer.

4. The last paragraph suggests that _______.

A. a modern computer won't be down.

B. computers can take the place of humans

C. sometimes a computer may bring suffering to people

D. there will be great changes in computers

答案

1-4: ADBC

填空题

氮是生命的基础,由于存在着氮的循环,生命世界才能像我们所见到的那样生机勃勃,充满活力。下图是自然界中氮的循环图,请回答有关问题。

(1)从空气中获取氮是人类长久以来追求的目标。下列有关说法正确的是_________(填序号)。

a.图中①②③④⑤都属于自然界的固氮过程

b.在过程⑥中,氮元素的化合价降低

c.反应②的化学方程式是N2 +O2 2NO

d.德国化学家哈伯发明了合成氨工艺,其主要反应如下2NH4Cl+Ca(OH)2CaCl2+2NH3↑+2H2O

(2)氨经氧化后可得到硝酸,而硝酸能与氨形成含氮量很高的肥料NH4NO3,施用于土壤而实现非自然形式的氮循环。但这种肥料不适宜与碱性物质共用,否则会降低肥效,其原因是_________________________________(用离子方程式表示)。

(3)人类活动对氮循环产生着明显的影响。汽车尾气中的NO,是造成光化学烟雾的物质之一,但NO对人体又起着独特的生理作用,被誉为“明星分子”,有三位科学家因此项研究成果而获得1998年诺贝尔奖。上述事实说明我们应辨证地看待化学物质的作用。科技人员已经找到了一些解决NO排放的方法。在汽车尾气排放管中安装一个催化转化器,可将尾气中另一种有害气体CO跟NO反应转化为空气中的两种成分。气体在催化剂表面吸附与解吸作用的机理如下图所示。

写出上述变化中的总化学反应方程式____________________________________。

单项选择题