A. Twice a day.
B. I think you need about an hour of exercise a day, Linda!
C. How often do you exercise, Linda?
D. How many minutes do you exercise?
E. About ten minutes.
F. Okay. I'm going to exercise an hour a day.
____→____→____→____→____→____
I ____ (wake) up at six this morning.
一辆以12m/s的速度沿平直公路行驶的汽车,因发现前方有险情而紧急刹车,刹车后获得大小为a=4m/s2的加速度,汽车刹车后5s内行驶的距离为()
近代有诗云“大将筹边尚未还,湖湘子弟满天山。新栽杨柳三千里,引得春风度玉关。”请问诗中的“大将”是指谁( )