单选题 The reason (that) (many of homemakers) buy kitchen appliances (厨房用品 ) is (that) they want to do their tasks (in a shorter length of time).

【正确答案】 A
【答案解析】固定句型:Thereason why….is that…:…的原因是…,why引导的是定语从句,在从句中担任原因状语。