问题补充：
In winter，when the sun hides behind the clouds，everyone feels a bit low. You may be tired and find you want to sleep all the time. What you may not know is：you are suffering from (患有) SAD(季节性抑郁症)．
But don worry—its normal. Colder temperatures and fewer hours of daylight can steal your energy and put you in a bad mood.
Read on to find out what SAD is and what you can do to help yourself or those around you.
These days，Linda，a US teenager spends most of her holidays sleeping instead of doing sports outside. She has also had trouble concentrating(集中精力) on her homework. When her mother asks her whats wrong，Linda doesn know what to tell her. Linda may not realize it yet，but shes suffering from SAD. It causes people to sleep，eat sweet food and get sad or angry for no reason.
About 15 percent of American people now suffer from SAD in winter according to the US Department of Health. The US government has taken measures to help people beat it. Local communities encourage people to take part in activities such as exercise，dance or art. And they advise people not to eat too much sweet food.
Like in the US，cold northern European countries such as Finland，Iceland and Russia see a large number of people suffer from SAD every year. So，the sunlamp is widely used in these countries. Its an electric lamp which is just like a “little sun” that gives off light to make people think the sun is shining and feel better.
【小题1】Colder and less are the main causes of SAD.
【小题2】Linda is feeling and doesn doing sports because shes suffering from SAD.
【小题3】people suffer from SAD innorthern European countries.
【小题4】In some northern European countries，the is widely used to make people feel.
【小题5】Taking an active part in and eating sweet food can help people beat SAD.temperature;daylight
答案：
(答案→)temperature;daylight
解析：这篇短文主要介绍了发生在美国和北欧冬季的季节性抑郁症，并对如何解决此一问题提出了几点建议。
【小题1】根据第二段Colder temperatures and fewer hours of daylight can steal your energy and put you in a bad mood.描述，可知填：temperature;daylight
【小题2】根据These days，Linda，a US teenager spends most of her holidays sleeping instead of doing sports outside. 及本段描述，可知填：sleepy;like
【小题3】根据最后一段cold northern European countries such as Finland，Iceland and Russia see a large number of people suffer from SAD every year.描述，可知填：：many;cold
【小题4】根据最后一段So，the sunlamp is widely used in these countries. Its an electric lamp which is just like a “little sun” that gives off light to make people think the sun is shining and feel better.描述，可知填：sunlamp;better
【小题5】根据Local communities encourage people to take part in activities such as exercise，dance or art. And they advise people not to eat too much sweet food.描述，可知填：sports;little
