选A.这图横轴是时间,纵轴是速度.一会加速一会减速,而且有几次速度为零,也就是停下了.B是一块石头从悬崖落下,速度应该是一直增加的.C是一个登山者上山下山,爬山没有这样的速度变化趋势,一般人爬山的速度应该是先快,后来因为累了就慢下来,下山时再快一点,总之与图不符.D是跨栏,肯定不会有停下的时候.A是一个人开车,看到几个停车标识,所以自然要停几次,也就是选A了.
which situation best describes the pictured funct
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