In tests, it shrank breast tumours by 80 percent and researchers believe it could also treat prostate, pancreatic, bowel and ovarian cancers. Even tumours that resist treatment with the best medicines on the market, including the "wonder drug" Herceptin, may surrender to the vaccine. The experiments so far have been on mice - but researchers hope to pilot the drug on people within two years. If all goes well, the vaccine could be on the market by 2020. Rather than attacking cancer cells, like many drugs, the new treatment arouses the power of the immune system to fight tumours. The search for vaccines has been prevented by fears that healthy tissue would be destroyed along with tumours. Researchers from the University of Georgia and the Mayo Clinic in the US focused on a protein called MUC1 that is made in bigger amounts in cancerous cells than in healthy ones.Not only is there more of it, but a sugar that it is "decorated" with has a distinctive shape. The vaccine trains the immune system to recognise the rogue sugar and turn its weapons against the cancer. "Cancer cells have a special way of thwarting the immune system by putting sugars on the surface of tumour cells so they can travel around the body without being detected," researcher Professor Sandra Gendler said. "To enable the immune system to recognise the sugar it took a special vaccine that had three parts to it. "She said it was this that "turned out to be a winning combination". How does the vaccine treat fatal cancers? A) It employs the power of the immune system to fight cancerous cells. B) It deprives a protein called MUC1 of its sugar. C) It attacks cancer cells like many drugs D) It destroys tumors along with healthy tissue
A
Until the twentieth century cigarettes were not an important threat to public health. Men used tobacco mainly in the form of cigars. They chewed tobacco, piped tobacco, and snuffed. Most women did not use tobacco at all. The cigarette industry began in 1870s with the development of the cigarette manufacturing machine. This made it possible to produce great numbers of cigarettes very quickly, and it reduced the price. Today cigarette smoking is a widespread habit. About forty-three percent of the adult men and thirty-one percent of the adult women in the United States smoke cigarettes regularly. It is encouraging to note, however, that millions of people have quit smoking. Seventy-five percent of the male population and forty-six percent of the female population have smoked cigarettes for some time during their lives, but twenty-six percent of these men and eleven percent of the women have stopped smoking. The number of persons who have given up smoking is increasing. Men as a group smoke more than women. Among both men and women the age group with the highest proportion of smokers is the age group 24--44. Income, education, and occupation all play a part in determining a person's smoking habit. City people smoke more than people living on farms. Well-educated men with high incomes are less likely to smoke cigarettes than men with fewer years of schooling and lower incomes. On the other hand, if a well-educated man with a higher income smokes, he's likely to smoke more packs of cigarettes per day. The situation is somewhat different for women. There are slightly more smokers among women with higher family incomes and higher education than among the lower income and lower educational groups. These more highly educated women tend to smoke more heavily. Among teenagers the _ is similar. There are fewer teenager smokers from upper-income, well-educated families, and also fewer from families living in farm areas. High school students who are preparing for college are less likely to smoke than those who don't plan... Which group of people smoked more according to the passage? A) The group of women. B) The group of teenagers. C) The group of men. D) The group of old people.
C
Q: If you walk slowly through downtown Helsinki during the day, taking in the splendid 19thcentury buildings, white boats and noise of passing trams , you will start to understand why it is called a city of two colors: white and blue. The sea is always present in Helsinki. When you take a walk over the great open space of the central square, you will hear seabirds screaming. When you take the tram ,suddenly and unexpectedly, you are faced with a calm, shining blue sea. You may notice that people in Helsinki do not rush about as in other cities. Instead ,they walk along the roads, politely letting other people by. An usual way to see Helsinki for the first time is to start out by the boats. You will walk by the elderly women selling fish and vegetables in the market square and find yourself in front of a beautiful park. You may enjoy a pleasant walk in the park for a few hours and then take the tram. Trams are the perfect way to get around in Helsinki. Watching the old houses, parks, theatres, churches, shops, restaurants and people in the streets, you may have a slightly sad film feeling to it. The pale summer nights are another wonder in the city. Following the waterfront of the city after sunset, you couldn't help stopping and listening to the sweet silence, interrupted only by the screaming seabirds and leaving fishing boats. However, in some way. Helsinki is also the most modern city in northern Europe. You will surely want to visit the white Glass Palace, the modern art museum, and all those extremely popular cafes and design stores. The 19thcentury buildings, the white Glass Palace, popular cafes and design shops in Helsinki all show that Helsinki is _ A) both splendid and traditional B) both quiet and noisy C) both historical and modern D) both old and new
A: C
*Question*
I've ridden a lot of buses in my time. There was the one in India that was so crowded, I had to climb onto the top just to breathe. Neither will I forget the bus in South Africa that was almost taken up by monkeys. No matter how entertaining they were at the time, none can compare to my first ride on what I now call the Leisure Village Local. When I first moved into Leisure Village, I didn't even know bus transportation was provided. Then I had an operation on my left foot and I couldn't drive. As I didn't want to keep making trouble for friends to shop for me, I decided to try out the Leisure Village Local. The next morning, undaunted, I stood with the support of my crutches and waited. Suddenly, the bus arrived. As soon as I boarded the bus, I discovered I was all by myself. Then the bus approached another stop, and four women climbed aboard. They sat next to me and introduced themselves. A few minutes later, we arrived at the Wal-Mart in Middle Island. As soon as we entered, one of my new friends showed me how to operate the motorized shopping cart . Another walked alongside the entire time, waiting to help if something was out of reach. One hour later, another insisted on carrying my bags onto the bus. And the fourth woman carried my bags to my front door when we got back. I thanked them all for their help, and told them I would see them soon. The next day morning, I found a brown paper bag at the front door. Inside was a giant bowl of chicken soup, and a note. "Get well soon." It was signed, "Your guardian angels." I rode the Leisure Village Local two more times later, but didn't see any of my guardian angels. Maybe they're helping someone else, I thought. Or, maybe they flew south for the winter. Why did the author decide to try out the Leisure Village Local? A) He had an operation to carry out. B) He has no other transportation choices. C) He was not permitted to drive by local law. D) He was too considerate to trouble his friends again.
**Answer**
D