(4) 当它后面的名词受 the, these, those 等特指限定词修饰时,或其后的接的是us, them这样的人称代词时,则此时必须用介词 of。如:
two dozen of these eggs 两打这种鸡蛋
three dozen of them 它们中的3打
注:score, hundred, thousand, million等也具有以上类似用法。
8. She raised her finger to her lips as _____ for silence.
A. an idea B. a mark
C. a sign D. a word
【陷阱】容易误选B。
【分析】应选C,sign与mark的区别是:sign 的意思是“迹象”、“征兆”gesture or movement made with the hand, head, etc, used to give information, a command, etc(用手或头等做出示意动作以传递信息或命令等),mark 的意思是 written or printed symbol or figure, line etc made as signor an indication of sth(书写与印刷的符号或图、线等记号)。根据此二词的语义区别以及常识可知答案为C。类似地,下面两题的答案也是C:
(1) Those black clouds are a sure _____ that it’s going to rain.
A. thing B. mark
C. sign D. one
(2) Just as a famous Chinese saying goes, a timely heavy snow is a ______ of good harvest next year.
A. mark B. track
C. sign D. appearance
但是,下面一题却不能选sign,也不能选mark,而选symbol(象征):
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