The reason ____ the people in the mainland go to Hong Kong to buy formula is that people are not convinced ____the safety of formula produced in the mainland.A.that; at B.why; at C.why; of D.what; of
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C解析试题分析：句意：大陆的人去香港买婴儿食品的原因是人们不确信在大陆生产的婴儿食品的安全性。第一空是why引导的定语从句，先行词reason，关系词在从句中作状语；第二空是是固定短语be convinced of确信。根据句意故选C。考点：考查定语从句及固定短语的用法。
点评：本题难度适中。定语从句的考查关键在于定语从句的成分分析，如果缺少主语，宾语，表语，定语就使用关系代词，否则，就使用关系副词。这里把定语从句与固定短语放在一起考查增加了试题的难度。即学即练：The Chinese government has made the Mid-Autumn Festival a legal holiday, ______ people will have a day off. A. when B. which C. where D. what解析：A。句意：考查非限制性定语从句。the MidAutumn Festival为先行词，指时间在从句中作时间状语，因此引导词用when。