According to a study carried out by an American university, when you eat has ______ on your mood as ______ you eat.A.much of as an effect; whatB.much of as an effect; whichC.as much of an effect; whatD.as much of an effect; which
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C解析试题分析：句意：据一家美国大学的研究，吃饭的时间与你吃的东西一样，对心情都会产生同样的影响。这里have an effect on对……有影响。as……as其中第一个as后不可以直接接名词； what引导的名词性从句,这里不是定语从句，因此不可以选用which。故选C。考点：考查形容词的比较等级的用法。
点评：本题难度适中。形容词的比较等级是高考常考的知识点，需要考生必须牢记它们的用法及意义。即学即练：She is ______ your father.A. as good a teacher as B. as a good teacher asC. good as a teacher as D. as good a teacher 解析：A。句意：她和你的父亲一样是个好老师。