第7题: [单项选择]______ these questions may sound specific, answers to them could have profound economic and political significance. A. Since B. Unless C. Lest D. While 参考答案:D 答案解析:本题考查状语从句。该句意为“虽然这些问题可能是具体的,但是回答这些问题会有深远的经济和政治意义”。specific“具体的”和profound“深远的”之间从逻辑关系上看应是转折关系。虽然这四个选项都