究竟是thirty percent of them is water还是thirty percent of them are water 为什么另外 如何判断类似句子中of后面的be是单数还是复数

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• 究竟是thirty percent of them is water还是thirty percent of them are water 为什么另外 如何判断类似句子中of后面的be是单数还是复数
• close的同义词是什么?我英语试卷上的close.
• 连词成句 are,you,the,top percent,in,ten thirty-five,are,runners,this,there,race,in,thousandfoil,and,pick,your,jacket,on,it,up,puta hero,in,she,is,country,our按要求改写句子they are putting up the curtains.(就划线句子提问）are,you,the,top percent,in,ten thirty-five,are,runners,this,there,race,in,thousand