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标题: 四级练习2013.08.06 [打印本页]

作者: Rebecca949    时间: 2013-8-6 09:59     标题: 四级练习2013.08.06

本帖最后由 Rebecca949 于 2013-8-6 10:06 编辑

[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.





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作者: longyuan    时间: 2013-8-7 21:30

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