Old-fashioned phones matter when wireless networks _____in disasters.A. turn down B. turn out C. break down D. break out 答案: C。本题考查动词短语的用法。turn down关小、调低、拒绝;turn out 证明是、结果是、生产;break down分解、发生故障、失败;break out爆发。无线网络会瘫痪,所以选C。 【句意】当无线网络发生灾难性故障的时候,过时的电话变得很重要。5.When is the art festival?A.On April 22ed B.On May 4th C.On June3rd.