填空题 .Hormone level—and hence our moods—may be affected by the weather. Gloomy weather can cause depression, but sunshine appears to raise the spirits. In Britain, for example, the dull weather winter drastically cuts down the amount of sunlight that is experienced which strongly affects some people. They become so depressed and lacking in energy that their work and social life are affected. The term SAD (Seasonal Affective Disorder) is used to describe such a condition. Sufferers can fight back by making the most of any sunlight in winter and by spending a few hours each day under special, full-spectrum lamps. These provide more ultraviolet and blue-green light than ordinary fluorescent and tungsten lights. Scientists are working to discover the links between the weather and human beings' moods and performance.
   

填空题 1. 

填空题 2. 

填空题 3. 

填空题 4. 

填空题 5.