OG11的一道题目，请教

Network of blood vessels in bat's wings serve only to disperse heat generated in flight, This heat is generated only because bats flap their wings. Thus paleontologists' recent discovery that the winged dinosaur Sandactylus had similar networks of blood vessels in the skin of its wings provides evidence for the hypothesis that Sandactylus flew by flapping its wings, not just by gliding.

The argument in the passage relies on which of the following assumptions?

A) Sandactylus would not have had network of blood vessels in the skin of its wings if these networks were of no use to use to Sandactylus

E) Heat generated by Sandactylus in flapping its wings in flight could not have been dispersed by anything other than the blood vessels in its wings.

这是道OG的题，题干下有三题，前两体没问题，就这题的两个选项。当时做对了，因为答案先出来我看了就选了，今天在看第二遍逐个分析的时候觉得E取非也能削弱原文，E和A我觉得是异曲同工之妙，是一个道理，没想明白，请大家帮忙想想，谢谢

arugment: networks of blood vessels in the skin of wings------->fly by flapping wings;

E: states the relationship between dispersing generated heat and blood vessel.  Actually, i found A is the prerequisite of E that vessel network should useful to sandactylus first, otherwise, it doesn't make any sense to conclude the relationship between vessel network and flying by flapping wings, it is very possible that gliding can also generate heat, which is dispersed by blood vessels.

A: network of blood vessels is useful to sandactylus