2022-2023学年北京市海淀区高三（上）期末英语试卷（含解析）

2022-2023学年北京市海淀区高三（上）期末英语试卷
We've all heard the saying "Laughter is the best medicine". And there might be something in this idiom. Numerous studies have shown that people who report greater (1) tend to have better medical outcomes.
For instance, a 2017 study at the University of Nottingham tested the effect of mood on 138 retirees (2) the normal flu injection. Those who felt happy on the day of the vaccination went on to (3) more flu-fighting antibodies. Earlier work at Yale University and the University of Florida has also shown that people's mood affects the activation of genes that fight disease.
But does happiness lead to good (4) , or is it the other way around After all, it could be that people who have strong immune systems (5) have higher levels of other mood—improving brain chemicals as well.
Here is a possible evolutionary (6) . Humans evolved as social creatures that cooperate in groups to (7) food and protect themselv......