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Read the following article and select the best answer. Article: 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, 100 to 400 deaths were 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... Question: From the passage we know that the most serious black smog disaster took place in _ . - London - New York - Los Angeles - Beijing
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London

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Read the following article and select the best answer. Article: Dear Mrs.Nugget, You may remember that we have discussed the noise your children make while practicing the piano.You agreed to make sure that they would stop practicing in the evenings. You can imagine my astonishment , then, when I realized that nothing had changed and the situation was going on as before.I find it difficult to stay in the house and invent any excuse to go out for the evening to be away from the terrible noise.Though I like music very much, I have had enough, and to be honest, I am not prepared to put up with the situation any more. I think it's high time that you realized your duty as a member of the community , and I must warn you that unless you do something about the situation I will be forced to take legal action. I have sent a copy of this letter to my lawyer. Mr.Barge Question: From the passage we can know that _ . - they had a talk before but nothing has changed - the children have stopped practicing in the evenings - Mrs.Nugget has done something to stop the situation - Mrs.Nugget has kept his promise
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they had a talk before but nothing has changed

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Read the following article and select the best answer. Article: There is a Web site called the "World Database of Happiness." It combines and analyzes the results of hundreds of surveys from around the world that have been conducted on life satisfaction. Most of the findings are predictable, but a few are surprising. The database makes it clear that there is not a strong connection between material wealth and general contentment. It is a cliche to say that money can't buy happiness, but the old saying seems to be supported by research. Many people still cling to the belief that gaining riches will be the answer to all their problems, yet they are probably mistaken. Studies have been carried out on people who acquired sudden wealth, such as lottery winners. In most cases, after the initial joy had worn off, people were not left with a sense of lasting happiness. In fact, they tended to revert to the way they felt before they became rich. Previously contented people continue to be contented, while those who were miserable before sink back into misery. If material wealth does not bring happiness, then what does? Perhaps happiness has something to do with where you live. The authorities at the World Database on Happiness have surveyed levels of happiness in different countries. Apparently, people in America, Canada, and Singapore are very happy; people living in India and Russia, not surprisingly, are not happy. Other surveys consistently point to the importance of relationships. Family relationships in particular seem to be the key to long-term contentment. The Web site suggests that falling in love and having children are two of the situations that bring the greatest happiness. Nowadays people look to technology as an alternative source of satisfaction. People increasingly spend more time alone watching TV or surfing the Internet rather than spending time with family. Can technology truly make people happy? It is too difficult to tell, but one thing is sure: If the Web site's research is accurate, time spent with your family is a better investment than time spent making money. Question: Which factor can bring lasting happiness definitely according to the study? - Sudden wealth. - Surfing the Internet. - Family relationship. - Winning lottery.
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Family relationship.