what is the difference between: a large number of &a large a

what is the difference between: a large number of &a large a the number of、a number of、large number的区别 a large number of 同义词 A large number of fa _____ the pupulation of china is!A what a large B what large a large number of ;large number of等的用法 There is a large number of还是there are a large number of 问：a large numberof ； the large number of ； a small number of a large number of 和a large quantity of What letter is a large body of the water a large quantity of;a large number of; quite a lot;a large a a large number