[求助]03-12-2-18,23

While it is true that bees’ vision is well suited to the task of identifying flowers by their colors, it is probable that flowers developed in response to the type of vision that bees have, rather than bees’ vision developing in response to flower color.

Which one of the following supports the statement above?

答案A：many insects that have vision very similar to that of bees do not depend on perceiving an object’s color.

这道题stimulus的意思，我不太明白。还有这个是causal relations么。如果是的话，可是根据causal realtions的strengthen的套路去做，走不通啊。大家帮忙看一下

03-12-2-23

Physics professors: some scientists claim that superheated plasma in which electrical resistance fails is a factor in causing so-called “ball lightning”. If this were so, then such lightning would emit intense light and, since plasma has gaslike properties, would rise in the air. However, the instances of ball lightning that I observed were of low intensity and floated horizontally before vanishing. Thus, superheated plasma with failed electrical resistance is never a factor in causing ball lightning.

The conclusion follows logically if which one of the following is assumed?

答案是E: all types of ball lightning have the same cause.

这道题totally不懂为什么是E。

大牛们快来帮我看一下啊。