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In general, observational studies tend to (i)____________ the effect of diet on overall health because a healthy diet is often (ii)____________ a healthy lifestyle. People who watch what they eat probably exercise more, avoid smoking, and follow other behaviors (iii)____________ good health. Any of those behaviors might also help explain why these people have lower disease rates.
- Blank(i)
- overstate
- clarify
- discount
- Blank(ii)
- irrelevant to
- a marker for
- a substitute for
- Blank(iii)
- caused by
- unrelated to
- linked to
overstate , a marker for , linked to 显示答案
以上解析由 考满分老师提供。
