1. TV is like a window on the world _______ you sit by it and fix your attention on what it shows.
A. if B. as C. while D. unless
【解析】选A。考查对句子间逻辑关系的理解。选项A表示条件；选项B表示时间或原因；选项C表时间；选项D表示否定意义的条件。根据句子的逻辑关系，选A。
2. Only if_______ many different questions _______acquire all the information you need to know.
A. you ask; will you B. do you ask; will you
C. do you ask; you will D. you will ask; do you
【解析】选A。only+if从句置于句首，从句不倒装，主句应倒装，在条件状语从句中，从句常用现在时表将来，主句常用将来时，故选A。
