一辆汽车沿平直公路运动,以速度v1=25m/s匀速通过前1/3路程,以速度v2=50m/s通过其余2/3路程,则汽车在全程中的平均速度是____________m/s。
37.5
—— Mum, I think I’m _____ to get back to school.
—— Not really, my dear. You’d better stay at home for another day or two.
A.so well
B.so good
C.well enough
D.good enough