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傍晚,小明陪妈妈在路灯下散步,当他们经过路灯时,身体的影长( ) A.先由长变短...
傍晚,小明陪妈妈在路灯下散步,当他们经过路灯时,身体的影长( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001046445089059/SYS201311030010464450890006_ST/images0.png)
A.先由长变短,再由短变长
B.先由短变长,再由长变短
C.保持不变
D.无法确定
考点分析:
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