专四

单选题It is well known that knowledge is the __________ condition for expansion of mind.

参考答案：D进入在线模考
【译文】众所周知，知识是开放性思维必不可少的条件。
【解析】近义形容词辨析题。in．含有否定意义。incompatible“不兼容的，不相容的”；incredible“难以置信的，不可思议的”：indefinite“不确定的，含糊的”；indispensable“必须的，不可或缺的”。

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