“This suggests that being hugged by a trusted person may act as an effective means of conveying support and that increasing the frequency of hugs might be an effective means of reducing the effects of stress,” Cohen said. “The apparent protective effect of hugs may result from the physical contact itself or hugging being a behavioral indicator of support and closeness. Either way, those who receive more hugs are somewhat more protected from infection.”

　　If you need any more reason to wrap your arms around someone special, consider this: hugs also lower blood pressure, reduce fears, improve heart health and decrease feelings of loneliness.

　　28. In Paragraph 1, the underlined words “ward off “can be replaced by ____.

　　A. produce

　　B. increase

　　C. prevent

　　D. support

　　29. Dr. Sheldon Cohen’s experiment shows that ____.

　　A. hugs can hide serious illness symptoms

　　B. social conflicts can monitor signs of infection

　　C. social support can reduce the risk of having a cold

　　D. depression and anxiety result from less social support

　　30.The passage aims to convey that ____.

　　A. hugs can have protective effects

　　B. social support can cure diseases 

　　C. interpersonal conflicts cause infections

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