阅读理解。 Washington(Reuters)-People who drink two or more sweetened soft drinks a week have a much higher risk of pancreatic cancer(胰腺癌),an unusual but deadly cancer,researchers reported on Monday. People who drank mostly fruit juice instead of  sodas did not have the same risk, the study of  60,000 people in Singapore found. Sugar may be to blame but people who drink sweetened sodas regularly often have other poor health habits,said Mark Pereira of the University of Minnesota,who led the study. 'The high levels of sugar in soft drinks may be increasing the level of insulin(胰岛素)in the body,which we think contributes to pancreatic cancer cell's growth,'Pereira said in a statement. Writing in the journal Cancer Epidemiology,Biomarkers & Prevention,Pereira and his colleagues said they followed 60,524 men and women in the Singapore Chinese Health Study for 14 years. Over that time,140 of the volunteers developed  pancreatic cancer. Those who drank two or more sweetened soft drinks a week had an 87 percent higher risk of being among those who got pancreatic cancer. Pereira said he believed the findings would apply elsewhere. 'Singapore is a wealthy country with excellent healthcare . Favorite pastimes (消遣) are eating and shopping,so the findings should apply to other Western countries,'he said. But Susan Mayne of the Yale Cancer Center at Yale University in Connecticut was cautious. 'Although this study found a risk,the finding was based on a relatively small number of cases and it remains unclear whether it is a causal(因果的)connection or not,'said Mayne,who serves on the board of the journal,which is published by the American Association for Cancer Research. Pancreatic cancer is one of the deadliest forms of cancer, with 230,000 cases globally. In the United States,37,680 people are diagnosed with pancreatic cancer in a year and 34,290 die of it. 1．According to the text,who is in control of the health study? A．Mark Pereira. B．Scientists from Singapore. C．Researchers in Yale. D．Susan Mayne. 2．We can infer from Pereira's words that __________. A．the healthcare in Singapore should be greatly improved B．2 soft drinks a day are considered harmful to health C．87 out of 140 volunteers developed pancreatic cancer D．sugar might not be the only cause of pancreatic cancer 3．How does Susan seem to feel about the findings of the study? A．Satisfied. B．Doubtful. C．Worried. D．Hopeful. 4．The best title of the text might be __________. A．The Deadliest Forms of Cancer B．Drink Fruit Juice Instead of Sodas C．A Study in University of Minnesota D．Sugary Soft Drinks Lead to Cancer