With this spring’s sports meet on 26th,April______, we find the track on the play ground newly______ with white paint and students of each class more united than ever.

A．in the corner, mark

B．around the corner, marked

C．in the corner, marking

D．around the corner, be marked

x₁、x₂是方程6x²-7x+a=0的两个实根，若和的几何平均值是，则a的值是( )．

A．2

B．3

C．4

D．-2

E．-3