There are two trees in a park, an oak tree and a pine tree. The shadow from the Pine tree is 32 feet long and the shadow from the Oak tree is 40 feet long. How tall is the Oak tree?
(1) The Pine tree is 24 feet tall.
(2) The Oak tree is 20 feet from the Pine tree.
答案是A， 解释说因为SHADOW与树的高度是成比例的.但是物理常识不是太阳照射角度不同，影子与高度的比例就不同吗？
我想问的是，以后再碰到类似题目，是不是将SHADOW/HEIGHT视为一个常数？ | 
