如果向北走20米记为是+20米,那么向南走70米记为( )米.
﹣70
色甘酸钠为()
A.抗贫血药
B.抗酸药
C.胃动力药
D.平喘药
E.祛痰药
Amy ____ after school every day.
A.walks to home
B.walks home
C.walk home
D.walk to home