A. ____
B. ____
C. ____
-- Anna, could you lend me this book, please?
-- I'm sorry. I it for only two days, and I haven't finished it yet.
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a、b两车在平直公路上沿同一方向行驶,运动的v﹣t图像如图所示,在t=0时刻,b车在a车前方s0处,在t=t1时间内,a车的位移为s,则( )