题目

Sweden’s society may be moving toward a cashless economy, an economy_________all payments are done electronically or via credit card. (用适当的单词填空) 答案：【答案】where【解析】考查定语从句。句意：瑞典社会可能正在走向无现金经济，一种所有支付都通过电子或信用卡完成的经济。____ all payments are done electronically or via credit card.是定语从句，先行词是economy，先行词在从句中做地点状语，故填where。函数y=21-xx+1的定义域为{x|x≤1且x≠-1}{x|x≤1且x≠-1}．