A $500 investment and a $1, 500 investment have a combined yearly return of 8.5 percent of the total of the two investments. If the $500 investment has a yearly return of 7 percent, what percent yearly return does the $1, 500 investment have ？（）

A.A

B.B

C.C

D.D

E.E

企业要全面推行质量管理，提高企业的素质，从而适应当前改革的形势，首先要（）。

A.加强标准化工作

B.提高人的素质

C.提高工作质量

D.提高工序质量