Questão #3885

Matemática — Inglês

The detail about the systems of improving memory are not popularized because:

A ( ) Their designers have financial interests over their students. B ( ) The few people who know such detail are never seriously questioned about them. C ( ) There are so many systems that their designer keep them secret to avoid competition. D ( ) There has always been a lack of interest in them.

Matemática — Inglês

Uma questão respondida. E as próximas?