passed、cleaded、helped、cooked,哪个发音不同

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• （2000•安徽）已知cosα＜0.5，那么锐角α的取值范围是（　　） A.60°＜α＜90° B.0°＜α＜60° C.30°＜α＜90° D.0°＜α＜30°