網友回答：
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
溫馨提醒：隨時光變遷，文中所陳述觀點；準確性、難免有所變動，因此文中觀點僅供參考。
