Cette lecture est tres vite pour moi

Adele, 

B2 level is  near native speaker level. 

This recording is fairly quick as expected at this level, but not as fast as some native speakers talk normally. 

Even for people at B2 level, 100% comprehension is not expected as the exercises at all levels should take you a bit beyond what you are already capable of.

Your profile indicates A1 - if this is correct, it would be expected that a B2 level exercise would be quite a significant stretch.