The past two weeks have been extremely painful, and 【小题1】 (everyone) heart is extremely strained with the outbreak of the COVID-19 in China.

Right now, some 1.4 billion Chinese 【小题2】 (spare) no effort in the fight against the outbreak. 【小题3】 (count) medical teams from all over China are in Hubei Province assisting in the fight, and saving lives 24/7.

Chinese citizens have devoted themselves to the 【小题4】strict) measures of prevention and control. We have our hearts 【小题5】 (set) on one goal — the race against time and fight against the virus. Every day, we witness heroic deeds from ordinary individuals, which brings tears to my eyes.

About 60 medical teams 【小题6】 (consist) of 11,000 doctors and medical staff have been sent off from other provinces to Hubei.

Many medical personnel have voluntarily asked 【小题7】 this dangerous assignment. A nurse, 【小题8】 has worked on the frontline for a week, could only give an air hug to her visiting daughter from a safe distance.

Face masks and protective goggles (护目镜) have left deep marks on the faces of medical personnel after wearing them 【小题9】 (day). The hands of some of the nurses have been scarred by constant disinfectant soaking. It’s hard and exhausting, 【小题10】 the medical staff have remained firm in their tasks.

In the past fifty days, the novel virus 【小题1】 (make) its way around China. It has a strong effect 【小题2】 our life and study. 【小题3】 (face) with the crisis, we students should respond （响应）to the appeal from authority and experts【小题4】(active). In order to ease the serious condition, all students had better do as follows:

First of all, stay at home and don’t go out if not necessary. Be responsible for 【小题5】(your) and others. In addition, do wear masks while you are in the open air, 【小题6】can reduce the risk of contracting the virus. 【小题7】 (wash) hands as often as possible is needed, too. Most importantly, everyone ought to have a positive attitude to the campaign with the disease. Attitude is everything.

My dear friends, there may be a long way【小题8】 (go) for us. Let’s work hand in hand to overcome 【小题9】 (anxious) and do whatever we can, 【小题10】 it is big or small. We have faith in the fact that tomorrow is another day.

People may start to feel down when the days get shorter in the fall and winter and begin to feel better in the spring, with longer daylight hours.

In some cases, these mood changes can affect 【小题1】 a person feels, thinks, and handles daily activities. If you have noticed that you experience a range of symptoms (症状), like having difficulty concentrating, becoming annoyed very easily, and withdrawing 【小题2】 social interactions, you may be suffering from seasonal affective disorder (SAD).

Women tend 【小题3】 (develop) seasonal affective disorder more than men. The condition often 【小题4】 (begin) in the third or fourth decade of life, though a few 【小题5】 (child) show signs of it. In most cases, SAD starts in the late fall or early winter and goes away during the spring and summer; this 【小题6】 (know) as winter-pattern SAD or winter depression.

Scientists do not 【小题7】 (full) understand what causes SAD. Research indicates that people with SAD may have reduced activity of the brain chemical serotonin (血清素), 【小题8】 helps regulate moods. Research also suggests that sunlight controls the levels of molecules (分子) that help maintain normal serotonin levels, but in people with SAD, this regulation does not function properly, 【小题9】 (result) in decreased serotonin levels in the winter.

The 【小题10】 (treat) for SAD is quite simple—light therapy. Being exposed to sunlight for 30 minutes can effectively ease people’s depression.