题目

做匀减速直线运动的物体，10s内速度由20m/s减为5m/s，则物体的加速度大小为（） A . 15m/s2 B . 1.5m/s2 C . 5m/s2 D . 0.5m/s2 答案：BDick is a twelve –year-old student. He comes from London. He lives in Beijing now. Dick goes to school from Monday to Friday. There are four classes in the morning and two in the afternoon. He doesn’t like Chinese food very much. He often plays tennis on Sundays. Dick doesn’t like singing .He likes watching TV. He isn’t good at Chinese. Sometimes people can’t understand him.根据短文内容，回答下列问题。1.How old is Dick ?2.Where does he live now?3.How many classes are there in a day?4.What does he often do on Sundays?5.Why can’t people understand him sometimes?