四级练习2013.08.06
[i=s] 本帖最后由 Rebecca949 于 2013-8-6 10:06 编辑 [/i][audio]http://sound.yywz123.com/tingbbs/cet4/cet420130806.mp3[/audio]
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 (1)________________________________.
The study involved more than 78,000 people, age 40 and older. Researcher Niroshan Siriwardena of Britain's University of Lincoln led the study.
"Our research suggests that (2)________________________________by about 19%." The reduction was even higher, 21%, for people who got their vaccination early in the flu season. The results were mathematically adjusted to reflect the fact that (3)________________________________ are more likely to get a flu shot.
**** Hidden Message ***** less cause heart attack
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