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六级练习2013.07.17


       
       





Getting a flu shot can help prevent influenza. But now, a large study in Britain indicates that older adults who get an annual flu vaccination are less likely to suffer a heart attack. _________________________________, age 40 and older. Researcher Niroshan Siriwardena of Britain's University of Lincoln led the study.
"Our research suggests that flu shots are associated with a reduction in relative risk of heart attack in adults by about 19%." _________________________________. The results were mathematically adjusted to reflect the fact that _________________________________ are more likely to get a flu shot.





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the study involved more than 78000 people
the reduction was even a higher 21% for people who got the vaccination early in the flu season.
people who are higher risk for heart attack the first place.

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the study involved more than 78000 people

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the student involved more than 78,000 people
the reduction is even higher 21% for people  who got their vestination early in the flu season
the people who has

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1.the study involved more than 78000 people;
2.the reduction was even higher 21% for people who got the vaccination early in the flussion season;
3.people who are higher risk for heart attack than first place

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the study involved more than 78 thousand people

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