第一关答题完毕，请屏蔽！！！
<P>第一题：a 从视觉角度上看是B亮,但A前面有物体挡住了.有阴影,所以A要亮一些.</P>
<P>第二题：b 高光的地方过亮，和暗影衔接不好．看着光比较硬．</P>
<P>第三题：最亮点：三角区 最暗点：眼睛．两腮，额头</P>
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