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光照：影子；（）。
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用灯光或日光照射物体在地面或墙面上就会产生影子这种现象就叫__________.
在阳光照射下的升旗广场的旗杆从上午九点到十一点的影子长的变化规律为
逐渐变长
逐渐变短
影子长度不变
影子长短变化无规律
下列说法正确的是
物体在阳光下的投影只与物体的高度有关
小明的个子比小亮高，我们可以肯定，不论什么情况，小明的影子一定比小亮的影子长.
物体在阳光照射下，不同时刻，影长可能发生变化，方向也可能发生变化.
物体在阳光照射下，影子的长度和方向都是固定不变的.
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