One genetic mutation(基因突变)occurs on average for every 15 cigarettes that a typical lung-cancer patient smokes, according to a study that has found for the first time all of the mutations happen during the lifetime of a cancer patient.
Scientists have completed a full genetic examinations of the genomes（基因组） of cancer patients, and hope the information will lead to a basic understanding of the causes of cancer—and possibly drugs and treatments—by making out the mutations that turn a healthy cell into a cancerous tumor cell.
They studied a lung-cancer patient who had about 23,000 DNA mutations in his lung cells that were connected with exposure(暴露) to the toxins found in cigarette smoke and had built up over his lifetime.
They also looked at a patient with malignant melanoma(恶性黑色肿瘤), the most dangerous form of skin cancer, who had got 30,000 special mutations known to be connected with exposure to sunlight.
Scientists believe this new finding into the genetics of cancer will finally lead to new drugs and perfect treatments that aim at the specific changes to the gene that cause the disease, as well as new techniques for discovering following cancers that have escaped from treatment in other parts of the body.
“For the first time, we have a complete map of all mutations in a cancer cell,” said Dr. Peter Campbell, who led the Cancer Genome project to work out the whole DNA system of tumor cells in order find the mutations.
A similar method was performed on the cells of a patient with skin cancer, which is how the researchers were able to show that the malignant skin cells contained changes that resulted from exposure to light.
“These are the two main cancers in the developed world for which we know the chief exposure. For lung cancer it is cigarette smoke, and for malignant melanoma it is exposure to sunlight,” Professor Campbell said.
【小题1】What can the genetic examination of the genomes of cancer patients be used for?

Among the many differences between Western and Chinese cultures, table manners are one of the most noticeable(显著的) differences. Westerners often make mistakes at the table in China or in a Chinese home. In order not to have an embarrassing（尴尬的） experience, here are some things to consider next time you are eating with some Chinese.
Step1:
Keep in mind that food is shared. It is one of the biggest differences between Chinese and Western eating habits. In China a few dishes are placed in the center of a table and shared by all. Also, you should offer thanks when a Chinese host takes food from one of the dishes on the table and places it on your plate. Refusing it would not be polite even if you are full.
Step2:
Respect the chopsticks. The chopsticks are the single most important tool at a Chinese table. Use the chopsticks to grab food and never skewer (叉) it. Also make sure to place your chopsticks over your bowl or plate. Don’t lay them on the table or even worse, stick them into the rice bowl.
Step3:
Use communal(共用的)chopsticks. To take food from the center of the table you should use the communal chopsticks or spoons that are placed there for that purpose. If there are no communal tools, use the other ends of your chopsticks to take food, remembering not to use the other end to put food into your mouth.
Step4:
Respect the elders. Table manners in China place extra respect on elders. At the table, pass food to your elders before taking it for yourself. If someone makes a toast, make sure that when you clink glasses with someone older than you, the rim of your glass is lower than the rim of the elder person.
【小题1】How can you use your chopsticks according to the passage?

When I was in college twenty-five years ago, I spent four summers working in 36 at a luxury hotel in downtown Chicago. 37 , I was a maid.
I did not enter the world of housekeeping enthusiastically. My friends had 38 jobs such as making ice cream, selling goods at the mall, or life guarding at the outdoor pool. I had been hoping to get a job as an office lady for a famous company: 39 pay, air-conditioned office, the gold standard for summer jobs, as most of us dreamed of. When that 40 , the only option left was to take a train ride downtown each morning to work as a maid.
It was tiring work, cleaning up to eighteen rooms a day. My 41 attitude reflected my disdain(鄙视) for cleaning toilets, 42 bed sheets, dusting, eight hours a day for the comfort of total strangers who 43 left a tip. I thought it was beneathme. My maid work was average 44  the day I was assigned to the eighteenth floor.
That was Lorena’s regular floor. The only time another maid set foot on it was on Lorena’s day off. If you left any water 45 on the mirror, or a hair on the bed, Lorena would hunt you down when she 46 , as I found out firsthand. She’d ended her lecture to me with “ 47 some pride in your work.”
She did. And so did Rosalie, Helen, Annette, and all the other experienced maids. Their devotion to doing a good job and their belief that their work was a 48 of their character stuck with me throughout my 49 career after graduation. I learned a lot from them during those four summers.
Not a week would go without one of them 50 some firm but friendly advice: “Where’s your commode brush? You don’t have one? How do you expect to get that bowl clean?”
Their pride in a job well done was reflected in how they treated 51 . They left the building at the end of the day in nice dresses and 52 makeup. They looked like they could have been attending an afternoon tea. And, 53 often, they were smiling and laughing, cheerfully greeting their co-workers a good evening. When you work with happiness and 54 , a job will be well done. I believe there is 55 in any job if you work hard and try your best.

C
Disposing (处理) of waste has been a problem since humans started producing it. As more and more people choose to live close together in cities, the waste disposal problem becomes increasingly difficult.
During the eighteenth century, it was usual for several neighboring towns to get together to select a faraway spot as a dump site. Residents or trash haulers (垃圾拖运者) would transport household rubbish, rotted wood, and old possessions to the site. Periodically some of the trash was burned and the rest was buried. The unpleasant sights and smells caused no problem because nobody lived close by. Factories, mills, and other industrial sites also had waste to be disposed of. Those located on rivers often just dumped the unwanted remains into the water. Others built huge burners with chimneys to deal with the problem.
Several facts make these choices unacceptable to modern society. The first problem is space. Dumps, which are now called landfills, are most needed in heavily populated areas. Such areas rarely have empty land suitable for this purpose. Property is either too expensive or too close to residential neighborhoods. Long distance trash hauling has been a common practice, but once farm areas are refusing to accept rubbish from elsewhere, cheap land within trucking distance of major city areas is nonexistent. Awareness (意识) of pollution dangers has resulted in more strict rules of waste disposal. Pollution of rivers, ground water, land and air is a price people cannot longer pay to get rid of waste. The amount of waste, however, continues to grow.
Recycling efforts have become common place, and many towns require their people to take part. Even the most efficient recycling programs, however, can hope to deal with only about 50 percent of a city's reusable waste.
64.  The most suitable title for this passage would be_______.
A. Places for Disposing Waste     B. Waste Pollution Dangers
C. Ways of Getting Rid of Waste     D. Waste Disposal Problem
65. During the 18th century, people disposed their waste in many ways except for_______.
A. burying it     B. recycling it     C. burning it     D. throwing it into rivers
66. What can be inferred from the third paragraph?
A. Farm areas will continue accepting waste from the city in modern society.
B. There is cheap land to bury waste in modern society.
C. It is difficult to find space to bury waste in modern society.
D. Ways to deal with waste in modern society stay the same.
67.  The main purpose of writing this article is to_______.
A. draw people's attention to waste management
B. warn people of the pollution dangers we are facing
C. call on people to take part in recycling programs
D. tell people a better way to get rid of the waste

There was once, in a little market-town not far from Upsala (瑞典一城市), a peasant who lived there with his family, digging the earth during the week and singing in the choir on Sundays. This peasant had a little daughter to whom he taught the musical alphabet before she knew how to read. Daae was a great musician, perhaps without knowing it. Not a violinist in Scandinavia played as he did. His reputation was widespread and he was always invited to set the couples dancing at weddings and other festivals. His wife died when Christine was entering upon her sixth year. Then the father, who cared only for his daughter and his music, sold his land and went to Upsala in search of fame and fortune. He found nothing but poverty.
He returned to the country, wandering from fair to fair, playing his Scandinavian music pieces, while his child, who never left his side, listened to him in delight or sang to his playing. One day, at Ljimby Fair, Professor Valerius heard them and took them to Gothenburg. He insisted that the father was the first violinist in the world and that the daughter had the making of a great artist. Her education and instruction were provided for. She made rapid progress and charmed everybody with her prettiness, her grace of manner and her real eagerness to please.
When Valerius and his wife went to settle in France, they took Daae and Christine with them. "Mamma" Valerius treated Christine as her daughter. As for Daae, he became ill with homesickness. He never went out of doors in Paris, but lived in a sort of dream which he kept up with his violin. For hours at a time, he remained locked up in his bedroom with his daughter, playing and singing, very, very softly.
Daae seemed not to recover his strength until the summer, when the whole family went to stay at Perros-Guirec, in a far-away corner of Brittany, where the sea was of the same color as in his own country. Often he would play his saddest tunes on the beach and pretend that the sea stopped its roaring to listen to them. And then he persuaded Mamma Valerius to allow him to leave for a while. At the time of the "pardons," the village festivals and dances, he went off with his violin, as in the old days, and was allowed to take his daughter with him for a week. They gave the smallest villages music to last them for a year and slept at night in a barn, refusing a bed at the inn, lying close together on the straw, as when they were so poor in Sweden. At the same time, they were very neatly dressed, refused the halfpence offered to them; and the people around could not understand the behaviour of this country violinist, who walked heavily on the roads with that pretty child who sang like an angel from Heaven. They followed them from village to village.
【小题1】 When he was in the countryside, Daae did NOT __________.