----______is the population of your city?

      -----About two million.

A .How many        B. How much      C. What       D. Which

_______is the population____the USA?

--_________is the population of the world ? 

--_________about 7 billion.

A. How many; It’s                  B. What; It’s                C. What; They’re

   is the population of China?

A、What         B、How many    C、How much.

  —_____ is the population of America?

—I don’t know. But I know it’s _______ than that of China.

A. What; smaller        B. How much; smaller   C. What; less