单选题 Chris's interest in his action-figure collection began to ______ as he completed elementary school and became a preteen; he was growing up.

(A) improve
(B) dilate
(C) exist
(D) wane
(E) thrive

【正确答案】 D

【答案解析】The context indicates that Chris was growing up, and therefore likely to lose interest in his action-figure collection. The word wane means to "decrease in intensity," so it is the best choice. The other answers are not supported by the context.