题目内容
London has always been known for its "black fogs. “ In the winter of 1952，a milky white fog rolled into the city. As the smoke poured into the air, it was so hard to see that people had to walk in front of the buses to guide them. In this way, the most serious air pollution disaster in history began. When it was over, more than 4,000 people had been killed by the thick black smog.
New York City has had several London-type smogs since 1950. Each time, there were from 100 to 400 deaths caused by the smog. Although these smogs were not as deadly as London’ s,
New York City has the worst air pollution problem in the United States.
In all the killer smogs, factories and homes poured smoke and fumes into the air from the furnaces. The chemical fumes combined with the water droplets in the fog to form harmful substances. These substances caused the illness of those who breathed the polluted air.
Usually, such harmful fumes rise into the upper air and are blown away by the wind. But sometimes there is an unusual weather condition called a temperature inversion. A layer of cold air remains near the ground as smoke and fumes pour into it. This is covered by an upper layer of warm air that acts like a lid. It prevents the polluted cooler air from rising. The harmful fumes pile up and make people ill. The smog may be so thick that airports are closed and chains of collisions occur on the highways.
Another type of smog occurs in Los Angeles. Here the weather may be clear and sunny. But stinging eyes and dry coughs show that harmful chemicals fill the air. The smog is due to invisible gases, mostly from automobile exhaust. Because these chemicals are changed by the sun high up in the air, it is called photochemical smog. It contains automobile exhaust fumes and nitrogen oxides changed by the sun's rays. Added to these are sulfur dioxide and other fumes from factories and oil refineries. Photochemical smog is found in many large cities all over the world.
Killer smogs don，t happen very often, fortunately. But in Beijing, a combination of automobile exhaust fumes, home furnace smoke, and factory waste gases pours into the air. This may also happen in the suburbs, or out in the country, where large factories have been built. A number of harmful substances have been found in the air there. When these substances are breathed in day after day ，the health of the population is affected.
51. Why do people call this phenomenon " black fog" ？
A. It is black and dirty. B. It can affect the health.
C. It can kill people. D. It is too thick for people to see something.
52. What can reduce the air pollution according to the passage?
A. Water. B. Wind. C. The sun. D. Cold air.
53.When photochemical smog happens in the city, _____.
A. many people will be killed B. black smoke may pour into the air
C. the weather may be fine D. people have to walk to work
54.From the passage we know that the most serious black smog disaster took place in_____
A, London B. New York C. Los Angeles D. Beijing
DBCA
Rome had the Forum. London has Speaker's Corner. Now always–on–the-go. New Yorkers have Liz and Bill.
Liz and Bill, two college graduates in their early 20s, have spent a whole year trying to have thousands of people talk to them in subway stations and on busy street corners. Just talk.
Using a 2-foot-tall sign that says, "Talk to Me." they attract conversationalists, who one evening included a mental patient, and men in business suits.
They don't collect money. They don't push religion. So what's the point?
"To see what happens, said Liz. " We simply enjoy life with open communication."
Shortly after the September 11,2001 attacks, they decided to walk from New York City to Washington, a 270-mile trip. They found they loved talking to people along the way and wanted to continue talking with strangers after their return.
"It started as a crazy idea, "Liz said." We were so curious about all the strangers walking by with their life stories. People will talk to us about anything: their jobs, their clothes, their childhood experiences, anything."
Denise wanted to talk about an exam she was about to take. She had stopped by for the second time in two days, to let the two listeners know how it went.
Marcia had lost her husband to a serious disease. "That was very heavy on my mind," Marcia said. "To be able to talk about it to total strangers was very good," she explained.
To celebrate a year of talking, the two held a get-together in a city park for all the people they had met over the past year. A few hundred people showed up, as well as some television cameramen and reporters.
They may plan more parties or try to attract more people to join their informal talks. Some publishers have expressed interest in a book, something they say they'll consider.
【小题1】What did Liz and Bill start doing after September 2001?
| A．Chatting with people. | B．Setting up street signs |
| C．Telling stories to strangers | D．Organizing a speaker's corner |
| A．pointless | B．normal | C．crazy | D．successful |
| A．They knew Liz and Bill very well. |
| B．They happened to meet the writer of the text. |
| C．They organized the get-together in the city park. |
| D．They are examples of those who talked to Liz and Bill. |
| A．Go in for publishing. | B．Do more television programs. |
| C．Continue what they are doing. | D．Spend more time reading books. |
| A．They have decided to wait a year or two |
| B．They will think about it carefully |
| C．They agreed immediately |
| D．They find it hard to do that |