"The long－held notion of endorphins being responsible for the runner's high is false. Endorphins are effective pain relievers, but only when it comes to the pain in your body and muscles you feel after working out，" Patrick Lucas Austin wrote on science blog.

　　Similar studies are yet to be carried out on humans, but it's already well known that exercise is a highly effective way to get rid of stress or anxiety.

　　The UK's National Health Service even prescribes(开药方) exercise for patients who are suffering from depression.

　　"Being depressed can leave you feeling low in energy, which might put you off being more active. Regular exercise can boost your mood if you have depression, and it's especially useful for people with mild to moderate(中等的) depression，" it wrote on its website.

　　It seems like nothing can beat that feeling we get after a good workout, even if we don't fully understand where it comes from. At least if we're feeling down, we know that all we have to do is put on our running shoes.

　　语篇导读　本文主要探究了运动后引起运动者情绪高涨的因素。

　　5．What did scientists from German universities recently discover?

　　A．Working out is a highly effective way to treat depression.

　　B．The runner's high could be caused by endocannabinoids.

　　C．Endorphins may contribute to one's high spirits after running.

　　D．The level of endorphins and endocannabinoids could affect one's mood.

　　解析　B　细节理解题。根据第三段可知，德国一些大学的科学家们发现跑步后的快感是由内源性大麻素引起的，故选B项。

　　6．The scientists gave mice drugs in their experiment to ________.

　　A．find what reduces the runner's high symptoms

　　B．see the specific symptoms of the runner's high

　　C．identify what is responsible for the runner's high

　　D．test what influences the level of endocannabinoids released

　　解析　C　推理判断题。根据第三、四段可推知，科学家们拿老鼠做实验是为了确定究竟是哪种物质会导致跑步者情绪高涨，故选C项。

　　7．The underlined word "notion" in Paragraph 7 has the closest meaning to ________.

　　A．effect 　 B．goal

　　C．question 　 D．belief

　　解析　D　词义猜测题。根据语境可知，画线词所在句子与第二段呼应，故notion指认知。D项belief与believed相呼应，故选D项。

　　8．According to the UK's National Health Service, regular workouts ________.

　　A．are the best way to treat depression

　　B．can help ease depression symptoms

C．only work for those with serious depression