题目

 The government is doing its best tothe cultures of the tribal people for fear that they may soon die out. A. preserve                 B. frustrate C. hesitate                     D. defend 答案：【解析】选A。考查动词词义辨析。根据句意, 应为保存部落文化, 故答案为A。preserve保护, 保存; frustrate挫败, 使灰心; hesitate犹豫; defend防卫。下列物质不能使红墨水褪色的是(　　)A．活性炭 B．过氧化钠 C．NaCl溶液 D．漂白粉