题目

It is human nature to think back to a golden age ______ one’s country was strong and respected. A. if               B. when               C. while             D. after 答案：B 【解析】考查状语从句的连接词。句意：当一个国家强盛和受到尊敬的时候，回忆过去的黄金时代是人类的天性。0.1 mol / L的醋酸溶液中存在电离平衡：CH3COOH CH3COO－＋H＋，若溶液温度从室温升高到60℃，则溶液A．pH增大 B．c(CH3COOH)增大C．CH3COOH电离程度增大 D．c(H＋)×c(OH－)＝1×10－14