By day a woman could safely walk the streets, but at night the pavements became( ). A、poisonous B、difficult C、dangerous D、harmful 【正确答案】:C 【题目解析】:本题考查形容词辨析。poisonous“有毒的”, difficult“困难的”, dangerous“危险的”, harmful“对…有害的”。句意:白天的时候,妇女可以安全地在街上行走,而到了夜晚人行道上会变得很危险。故选C。