17.Being a tour guide, one needs to be more concerned about the major important matters instead of spending too much time ________ on issues.
(A) sensible
(B) voluble
(C) effusive
(D) frivolous
frivolous KK[ˋfrɪvələs] DJ[ˋfrivələs] adj. 輕薄的,輕佻的;無聊的,瑣碎的[+to-v] adj.形容詞 輕薄的,輕佻的 He made some frivolous remarks. 他說了些輕佻話。 無聊的,瑣碎的[+to-v] He spent a lot of his money on frivolous things. 他在一些無聊的事上花了好多錢。 It was frivolous of him to make such an accusation. 他提出這樣的指控真無聊。