Translation (5 minutes)

　　87. David turned away and walked quickly down the street, ________________（完全无视他的存在）.
　　88. It is man’s intellect__________________(才使他区别于其他高等动物).
　　89. I read the book last week, but now it is _______________(哪儿也找不到了).
　　90. Hardly had John finished his introductory remark _________(他就被听众打断了).
　　91. If the reaction were to take place_______________(巨大的能量就会被释放出来).

　　【答案】
　　87. totally ignoring his presence
　　88. that distinguishes him from other higher animals
　　89. found nowhere/nowhere to be found
　　90. when he was interrupted by the audience
　　91.enormous energy would be released