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.

　　50．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.

　　51．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

　　52．How does Susan seem to feel about the findings of the study?

　　A．Satisfied.

　　B．Doubtful.

　　C．Worried.

　　D．Hopeful.

　　53．The best title of the text might be________.

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