Some people feel sad or depressed during the winter months in northern areas of the world. They may have trouble eating or sleep

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问题   Some people feel sad or depressed during the winter months in northern areas of the world. They may have trouble eating or sleeping. They suffer【C1】______a condition known as Seasonal Affective Disorder, or SAD.
【C2】______of SAD【C3】______its effects during the short, dark days of【C4】______. The problems are most【C5】______in the months when there are fewer hours of daylight. When spring arrives, these signs【C6】______and SAD victims feel【C7】______again.
  The National Mental Health Association reports that SAD can【C8】______anyone. The group says young people and women are【C9】______the highest risk for the disorder. It says that an estimated twenty-five percent of the American population suffers from some form of SAD. About five percent suffer from a severe form of the【C10】______.【C11】______, many people in other parts of the world also have the condition.
  To treat the disorder, victims of SAD do not need to wait until【C12】______. Experts know that【C13】______affected individuals【C14】______bright light each day【C15】______the condition.【C16】______, there are other things people can do to ease the problem. They can【C17】______the sunlight in their homes and workplaces. They can spend【C18】______time outdoors in the fresh air during the day.
  One study found that walking for an hour in winter sunlight was as【C19】______as spending two-and-one-half hours in【C20】______light indoors.  
【C5】

选项 A、dangerous
B、severe
C、critical
D、essential

答案B

解析
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