多选题 Unlike some entertainers whose performances rarely vary, jazz great Louis Armstrong frequently ______ during his performances, spontaneously ______ new phrasing in existing songs.
【正确答案】 B、E
【答案解析】[解析] ●Unlike和rarely取反。
●两空联动，同义重复；第一空与vary(变化)同义重复。
●vocalize说，improvise即兴创作，deliberate权衡；bungle搞砸，introduce引入，rehearse彩排。答案选BE。