Integrated skills a one, listen to the report and answer the following questions. Short lightness is a common problem among chinese students. IT refers to the inability to see objects at a distance. Clearly, these days, more and more chinese students are affected by shortsightedness increasingly at a Younger age. According to a national survey of students health, the percentage of chinese primary school students who suffer from short sightless is thirty six percent. Among junior high school students, the number increases to seventy one point six percent, and as for senior high school students, eighty one percent of them need to wear glasses. These high figures vary both teachers and parents. Shortsighted ness can have a significant effect on students. IT can make IT inconvenient for them to play certain sports, such as basketball and swimming. In some cases, IT may even give rise to other eye problems. What causes short sightings has not been fully understood. IT is commonly believed that people whose parents are short sided are more likely to suffer from the condition. However, how people use their eyes maybe a key factor. Individuals who spend a large amount of time reading, working at a computer, focusing on a smart phone screen, we're doing other close work, are at higher risk of developing shortsightedness. These activities become even more dangerous. When coupled with poor lighting or bad reading habits such as reading in bed, spending two little time outdoors can also cause the problem. Students with short sighted ss may look at things with their eyes partly shut or move closer to objects to see clearly. Sometimes they may complain of tired eyes and headaches. These are all signs of short sightless.