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A Chinese study found that antibiotics can help prevent stomach cancer in people who carry a common strain of bacteria known to cause ulcers. The study adds to the already strong evidence that Helicobacter pylori bacteria can cause stomach cancer, a disease especially prevalent in Asia but far less common in the United States. Still, experts said the findings do not solve the dilemma of whether and how to treat carriers of the bacteria.
The study involved 1,630 men and women from Fujian Province in southern China. All were carriers of H. pylori; hundreds of them already had precancerous lesions (癌变) at the outset of the study. Patients were randomly assigned to receive two weeks of treatment with antibiotics and an anti-ulcer drug, or a dummy medicine, and were followed for 7 years and a half after that. Among the 988 patients without precancerous lesions at the outset, none on the treatment got stomach cancer, compared with six in the placebo group.
The findings among those with precancerous lesions were not as clear-cut: Seven in the treatment group developed stomach cancer, versus 11 in the placebo group. The study appears in Wednesday’s Journal of the American Medical Association. H. pylori is estimated to affect as many as 90 percent of people in some developing nations and up to 50 percent of people in some industrialized countries, according to the World Health Organization. Chronic H. pylori is thought to cause stomach cancer, and doctors have come to believe since the early 1980s that it is the No. 1 cause of ulcers.
The findings suggest that doctors should consider routine screening for such lesions in H. pylori patients in high-incidence areas, and treating the infections in patients with no precancerous lesions, said the authors, led by Benjamin Chun-Yu Wong of the University of Hong Kong.
Dr. Michael Brown, a gastroenterologist at Rush University Medical Center in Chicago, said routine H. pylori screening would not be cost-effective in the United States because the rates of infection and cancer are so low.
1. According to the passage, experts in the Chinese study mentioned in the passage are still not ____.
2. Among people who developed cancer in the study, proportion of patients in the treatment group to patients in the placebo group is ____.
3. In the study, what medicine did the placebo group take during the two-week treatment?
4. How many patients in the study already had precancerous lesions at the outset of the study?
5. The findings of the study propose that ____.

问题1选项
A.whether Helicobacter pylori bacteria can cause stomach cancer
B.whether stomach cancer is more prevalent in Asia
C.whether to treat all carriers of Helicobacter pylori bacteria
D.whether Helicobacter pylori bacteria can cause stomach ulcer
问题2选项
A.64%
B.50%
C.90%
D.39%
问题3选项
A.Antibiotics.
B.A dummy medicine.
C.An anti-cancer medicine.
D.Medicine for the precancerous.
问题4选项
A.1467.
B.988.
C.815.
D.642.
问题5选项
A.H. pylori patients in high-incidence areas should be screened and treated
B.patients with precancerous lesions are not as easily cured as those without
C.treatment should be given to H. pylori patients without precancerous lesions
D.treatment should not be given to H. pylori patients with precancerous lesions
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