第17题: [单项选择]Water is an essential global resource and it is up to each of us to ______ it. A. preserve B. maintain C. reserve D. conserve 参考答案:D 答案解析:动词辨析题,conserve意思是“保存;节约”,暗含谨慎或节省地使用以避免浪费。preserve意思是“保护,保持,保存”,暗含保持处于完善或不变的状况中,维持不变。maintain意思是“维持,维