填空题 In William Roberts' experiment, monkeys learned to take one date because they foresaw they would be 1 in the future.

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【正确答案】 1、thirsty    
【答案解析】[定位] 由题干中的William Roberts定位到第10段,再由monkeys learned to定位到该段后2句The monkeys learned to choose one date...they anticipated becoming thirsty in the future.
[精解] 此处需要填入形容词性成分。题干中的foresaw与原文中的anticipated属同义词,所以答案为thirsty。