do you like biscuits ? yes ,i do .i like biscuits ,but i do not want one now .biscuits是复数,为什么这里还可以用one 而不是 but i do not want any now ?

do you like biscuits ? yes ,i do .i like biscuits ,but i do not want one now .biscuits是复数,为什么这里还可以用one 而不是 but i do not want any now ?
do you like biscuits ? yes ,i do .i like biscuits ,but i do not want one now .
biscuits是复数,为什么这里还可以用one
而不是 but i do not want any now ?

do you like biscuits ? yes ,i do .i like biscuits ,but i do not want one now .biscuits是复数,为什么这里还可以用one 而不是 but i do not want any now ?
前面表泛指,后面指的是“现在我一块都不想吃” one = a piece of biscuit

可以用any，但语气没有原句强！平常的交际用语要比较语气强弱的！

one 用来指代上面提到的biscuit