choose the best answer?请给出原因?

1、复数为：monkeys
pl.mon.keys;
【复数】 mon.keys;
Any of various long-tailed,medium-sized members of the order Primates,including the macaques,baboons,guenons,capuchins,marmosets,and tamarins and excluding the anthropoid apes and the prosimians.
猴子任一种长尾、中等体型的灵长类动物,包括猢狲、狒狒、卷尾猴、狨和小绢猴,不包括类人猿和原猴类
One that behaves in a way suggestive of a monkey,as a mischievous child or a mimic.
象猴的人行为举止象猴的人,如淘气的小孩或善于模仿的人
2、对的