Researchers, writing in the journal Heart, pooled data from 23 studies and found that social isolation or feelings of loneliness were tied to an increased risk of coronary heart disease (冠心病) and strokes.
The studies included data from 181,006 men and women ages 18 and over. There were 4,628 coronary events and 3,002 strokes in follow-up periods ___26___ from three to 21 years. Three of the papers ___27___ loneliness, 18 looked at social isolation and two included both. Social isolation and loneliness were determined with questionnaires; the researchers depended on medical records and death ___28___ for determining coronary events and strokes.
The scientists found that loneliness and social isolation increased the ___29___ risk of having a heart attack or a death from heart disease by 29 percent, and the risk of stroke by 32 percent. There were no ___30___ between men and women.
"People have tended to focus from a policy point of view on ___31___ lonely people to make them more ___32___," said the lead author, Nicole K. Valtorta, a research fellow at the University of York in England. "Our study ___33___ that if this is a risk factor, then we should be trying to prevent the risk factor in the first place."
The authors ___34___ that this was a review of observational studies and did not 35 cause and effect.
（本题出自2022年12月四级真题卷一）
答案&解析：
26.L
27.H
28.B
29.M
30.E
31.O
32.C
33.D
34.A
35.F
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