What does cumulative mean in terms of schoolwork? in own words.

(Studying constant data while not property time pass in between produces abundant less learning.) A additive test implies that in December you are going to possess to restudy no matter you learned back in Sep. ... Spaced learning is particularly necessary for long-run learning

Explanation:

the sentence that best describes the tone of the passage from the radio broadcast compared to the passage from the book is b. the radio broadcast has a more surprised tone.

consider the text evidence: in the passage from the book, the description is more matter-of-fact. it is simply describing the things resembling little grey snakes, but there is no urgency in the description. on the other hand, in the passage from the radio broadcast, there is definetely urgency (you can tell from the expression used, "good heavens", which clearly indicates surprise.)