Are you a____(健康的) child? Bob, a 14-year-old boy, is very unhealthy. He likes to ____ (乘坐) his father's car to school. Sometimes he goes to school by ____(地铁).  He does exercise only ____ ( 一次) a week. He likes eating ____(垃圾) food very much. This week his parents are in Paris on ____ (度假). So he eats lots of unhealthy food every day. Now Bob is badly____(生病的) in hospital. The doctor says, “ You should ____ （经常）do exercise, and have a good ____(饮食) habits. It's ____ (重要的) for your health. 

时钟在1点20分，时针与分针的最小夹角为____ 

下列描述正确的是（    ）

2015年我市油菜获得大面积的丰收，种植大户王师傅家的长10m，宽8m的仓库中堆了1m厚的小圆粒状菜籽，王师傅请小明帮他估算这些菜籽质量．小明将菜籽样品带到学校，进行下面的实验：