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【单选题】
一辆汽车从静止开始由甲地出发，沿平直公路开往乙地，汽车先做匀加速直线运动，接着做匀减速直线运动，开到乙地刚好停止，其速度－时间图像如图所示，那么0～t 0 和t 0 ～3t 0 两段时间内的（）A.
加速度大小之比为1∶3
B.
加速度大小之比为3∶1
C.
位移大小之比为2∶1
D.
位移大小之比为1∶2
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【单选题】他生活在唐朝由盛转衰的历史时期,其人忧国忧民,人格高尚,诗艺精湛;其诗多涉笔社会动荡、政治黑暗、人民疾苦。(诗圣,[ * ])
A.
李白
B.
杜甫
C.
白居易
D.
杜牧
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