Question

a variety of 和 varieties of 的谓语动词用法

a variety of books
a variety of information
varieties of informationg
其后谓语动词分别应用单数还是复数?

Answer 1

1：a variety of + 复数形式，谓语动词用单数：
I have a variety of books at home.
Society is made up of a variety of people.
A variety of other drying places was devised.

2：varieties of + 复数形式，谓语动词用复数
We offer over 100 different varieties of Corn Snakes.
Varieties of Lattices .
New Varieties of Food Additives, which were deliberated ......

类似这类量词都是一致的，比如a great amount of 和 great amounts of.

Answer 2

varieties of后面只加可数名词的复数形式，两者没什么区别，意思是“各种各样的……”