高速公路行驶时速100km/n时，车辆间距应保持在多少米以上？
参考答案：
若时速100公里，与前车要保持100米以上的距离。
He says he likes reading, but we_____________ see him read.
A. never B. often C. sometimes D always
Her father usually does ________ after dinner, such as does the dishes, sweeps the floor, takes out the
trash and so on. [ ]
A. chores
B. shopping
C. exercise
