只修饰可数名词复数：a large/great /good number of；a good / great many /dozens /stores of , quite a few
只修饰不可数名词：a great deal / a large amount of , quite a little
可数和不可数名词均可修饰：plenty of , a lot of , lots of , a large quantity of
audience 是不可数，所以应该是a large amount of audience才对
