题目

 The government is doing its best to   the 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。
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