网友回答：
they must spend a lot of time on doing their homework so that their eyesight becomes worse and worse. and the more time they spend on those， there is a bad influence on their health. the test standard has been used to appraise performance of students. so
温馨提醒：随时光变迁，文中所陈述观点；准确性、难免有所变动，因此文中观点仅供参考。
