1. During a short interval of time the speed v in m/s of an automobile is given by v = at² + bt³, where the time t is in seconds. The units of a and b are respectively:
(A) m-s²； m-s³
(B) m-s³； m-s⁴
(C) s³/m； s⁴/m
(D) m/s²； m/s³
(E) m/s³； m/s².

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