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"The ********ed coward! He didn't even stop his car."
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- ĐỀ SỐ 20Psychologists are interested in the reasons why some people like taking part in risky sports. (1) ____ they studied people who were learning to jump from a plane with a parachute, they found that parachutists' bodies (2) ______ large amounts of two hormones, adrenaline and nor adrenaline, just (3)_____they made their jump.These hormones help to prepare us for any sudden activity. Adrenaline increases the (4)______ rate and provides more sugar for the muscles, while nor adrenaline does make us react more quickly. (5)_____, nor adrenaline also stimulates a part of the brain which controls feelings of pleasure. Some psychologists (6)_____ concluded that it is a feeling of pleasure caused by this hormone which makes (7)_____ people want to participate in dangerous sports. Another possible reason is the level of arousal (8)_____ part of the brain.According to some psychologists, the brain tries to maintain a certain level of arousal. They believe that people who normally have a low level of arousal (9)____ for excitement and new experiences in order to stimulate themselves, whereas people who usually have a high level of arousal try to avoid risks and unfamiliar (10)_____ in order not to become overexcited. If the psychologists are right, people with a low arousal are the ones who enjoy participating in dangerous sports and activities.