单选题
Bridging a gap in the market between fast-food joints and full-service restaurants, fast-casual chains are enjoying success across the world. The 25 sales of American fast-casual outlets rose by 10.5% last year, 26 with 6.1% for fast-food chains, according to Mintel, a market-research firm. There are three main reasons why these outlets have been winning customers. First, they promise 'fresh' food, meaning at the very least not 27 . Chipotle also says it uses, where possible, meat from animals raised without hormones or antibiotics (抗生素). Having once been controlled by McDonald's, Chipotle is now a threat to its 28 parent. Although still relatively small, it is enjoying 20% annual growth, quite a feat in the 29 restaurant market. Second, they offer diners a high level of customisation, such as choosing each 30 in a sandwich, or burger. This 31 to fussy eaters and those with allergies. Third, clever pricing helps these chains 32 their profits. They offer some dishes at around the same price as those at burger joints, but they seem to be better than McDonald's at persuading diners to buy pricier dishes and extras. Fast-casual chains 33 manage to squeeze 40% more out of each diner's wallet than fast-food joints do. For all their success so far, some of the fast-casual chains are finding that as they get bigger, they come under more scrutiny. Campaigners have recently criticised Chipotle and Panera Bread for using ingredients from genetically-modified crops and artificial additives (添加剂). Fast-casual restaurants are joining the 34 of big business and having to endure the attention that comes with it. A. appeals F. current K. optimize B. combined G. especially L. ranks C. compared H. former M. raw D. conforms I. frozen N. removes E. crowded J. ingredient O. typically
【答案解析】动词辨析题。分析句子成分可知,空格所在句是help sb. do sth. 结构,在这一结构中,缺少do。本句意为:第三,灵活的定价使这些连锁店的利润______。根据clever pricing“灵活定价”与profits“利润”之间的关系可知,optimize“使最优化”符合句意,故为答案。