保本作业率是指（）的百分比。

A、保本点业务量占现有或预计销售量

B、保本点销售额占现有或预计销售量

C、保本点业务量占现有或预计销售额

D、保本点销售额占现有或预计销售额

Which of the following statements is true of John Maynard Keynes
a. He liked to attend beauty contests.
b. He would keep on buying and selling hot stocks.
c. He often bought in stocks of lesser companies.
d. He preferred investing stocks to trading stocks.