A
(2020· 亳州联考)
Running is often tiring and a lot of hard work, but nothing beats the feeling you get after finishing a long workout around the track.
But while it’s long been believed that endorphins(内啡肽)—chemicals in the body that cause happiness—are behind the socalled “runner’s high”， a study suggested that there may be more to this phenomenon than we previously knew.
According to a recent study published by a group of scientists from several German universities, a group of chemicals called endocannabinoids(内源性大麻素) may actually be responsible for this familiar great feeling.
To test this theory, the scientists turned to mice.
Both mice and humans release high levels of endorphins and endocannabinoids after exercise, along with many other chemicals. After exercising on running wheels, the mice seemed happy and relaxed and displayed no signs of anxiety.
But after being given a drug to block their endorphins they changed. However, when their endocannabinoids were blocked with a different drug, the runner’s high symptoms seemed to fade.
“The longheld 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 a 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.
【解题导语】 本文主要探究了影响运动者情绪高涨的因素。
1．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.
B 解析：细节理解题。根据第三段“According to a recent study published by a group of scientists from several German universities, a group of chemicals called endocannabinoids(内源性大麻素) may actually be responsible for this familiar great feeling.”可知，德国一些大学的科学家们最近发现了跑步者情绪高涨是由内源性大麻素引起的，故选B。
2．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
C 解析：推理判断题。根据对第二段和第三段的整体理解，并结合第四段“To test this theory, the scientists turned to mice.”可推知，科学家们在实验中给老鼠药物是为了确定究竟是哪种物质会引起跑步者的情绪高涨，故选C。
3．The underlined word “notion” in Paragraph 7 has the closest meaning to “________”．
A．effect B．goal
C．question D．belief
D 解析：词义猜测题。根据对全文内容的理解可知，该词所在句子与第二段“But while it’s long been believed that endorphins(内啡肽)—chemicals in the body that cause happiness—are behind the socalled ‘runner’s high’， a study suggested that there may be more to this phenomenon than we previously knew.”呼应，并结合本句结构可推知，此处notion与believed相呼应，故选D。
4．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
D．can help people completely recover from depression
B 解析：细节理解题。根据倒数第三、四段和倒数第二段第二句“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.”可知，常规锻炼有利于情绪好转及缓解抑郁症状，故选B。
