(2013·豫北三校联考)Friendship is both ________ source of pleasure and ________ component of good health.

A．a; a

B．/; /

C．the; a

D．a; the

有下列程序，运行后变量x1、y1和z1的结果分别是 (13) 、 (14) 和 (15) 。
Private Sub funl(s，m，n)
s=m+1
m=n+2
n=s+3
End Sub
Private Sub form_Click( )
Dim x1，y1
x1=1:y1=1:z1=1
Call fun1(x1，y1+1，(z1))
Debug.Print x1；y1；z1
End Sub