题型：语法填空（语篇） 题类：常考题 难易度：困难
山西省临汾第一中学2017-2018学年高二下学期英语期末考试试卷
What are the benefits of laughter? Laughter (use) as a signal for being part of a group —it signals acceptance and positive interactions with others. In fact, laughter is important, and has been shown to have many (benefit) effects on the human body in different ways. Just check out these health benefits of laughter.
Boosts (增强) your immune system. (study) have shown that laughter boosts the immune system, increasing the number of antibody-producing T cells. This then makes us less likely (catch) coughs and colds. It also lowers the levels of at least four hormones (激素) which are connected with stress. So, after a good laugh you should be far less anxious.
Improves your breathing. Laugh more and more, because laughter empties your lungs of the air it takes in, resulting in a cleansing effect - similar deep breathing. This is (especial) helpful for people who are suffering from asthma (哮喘).
Protects your heart. Your heart is a muscle and, like any muscle in your body, it gets (strong) and functions better when exercised. Regular laughter is like (get) a gym membership for your heart. The study said that 15 minutes of laughter a day is as important for your heart 30 minutes of exercise 3 times a week.
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