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Passage TwoQuestions 29 to 31 are based on the passage you have just heard.
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Passage Two People from large families have an increased risk of stomach cancer, suggests a study that followed more than 7,000 Japanese-American men for 28 years. The study concluded that family size had a major influence on the development of stomach cancer linked to the bacterium Helicobacter pylori (幽门螺杆菌), and that younger siblings (兄弟，姐妹，同胞，同属) from large families were especially prone to the most common form of stomach cancer. H. pylori lives in the mucous (黏液的) layer of the stomach and is associated with peptic ulcers (消化器官溃疡) and stomach cancer. It’s estimated that half of the world’s population carries H. pylori in the stomach. It can be transmitted orally from person to person or through contact with human feces (粪便). The study found that men who carried certain strains of H. pylori in their stomachs and had seven or more siblings had more than twice the risk of developing stomach cancer, compared to men with the same H. pylori strains who had one to three siblings. The findings are published in the January 16 online issue of the journal Public Library of Science Medicine. "This is a very carefully controlled study that clearly shows that there are factors in early childhood that affect the risk of developing cancer many decades later," study leader Dr. Martin J. Blaser, professor and chairman of the Department of Medicine, and professor of microbiology at New York University Medical Center and School of Medicine, said in a prepared statement. "That early childhood events affect the risk of cancers occurring in old age is remarkable, and this may be a model for other cancers," Blaser said. He said that younger children in large families may acquire H. pylori from older siblings at a time when the younger children’s immune systems are still developing. This, in combination with the fact that the bacterium is already adapted to a genetically related person, means the younger children may have a more virulent H. pylori population in the stomach than if they’d acquired the germ from a non-relative. Which of the following statements can best generalize the passage
肿胀以下颌角为中心的是( )
慢性根尖周炎的检查方法( )
When Christopher Columbus landed on America’s shore, he encountered copper-skinned people whom he promptly called "Indians". Current estimates indicate that there were over a million Indians inhabiting North America then. There are approximately 800,000 Indians today, of whom about 250,000 live on reservations. The early settlers had an amicable relationship with Indians, who shared their knowledge of hunting, fishing, and farming with their uninvited guests. The stereotyped stealthy, wicked Indian of modem western movies was created by indifferent, faithless white men; the Indian was born friendly. Disgust developed between the Indians and the settlers, whose encroachment on Indian lands provoked an era of turbulence. As early as 1745, Indian tribes joined together to drive the French off their land. The French and Indian war did not end until 1763. The Indians had succeeded in destroying many of the western settlements. The British superficially submissive to the Indians, promised that further migrations west would not extend beyond a specified boundary. Evicted from their land or, worse still, frankly ceding their property to the whites for a few baubles, Indians were ruthlessly pushed west. The battle in 1876 at Little Big Horn River in Montana in which Sitting Bull and the Sioux bribes massacred General Custers cavalry, caused the whites to intensify their campaign against the red men. The battle at Wounded Knee, South Dakota, in 1890 put an end to the last vestige of hope for amity between Indians and whites. Although the Bureau of Indian Affairs has operated since 1824, presumably for the purpose of guarding Indians’ interests, Indians on reservations lead notoriously deprived lives. In recent times irate Indians have taken a militant stand and have appealed to the courts and the American people to improve their substandard living conditions. From the passage, we can infer that the author’s attitude towards Indians is ______.
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