男性，65岁。确诊慢性支气管炎、肺气肿5年，此次再次发作，呼吸困难加重且伴有发绀入院，未吸氧。下列血气结果与之相符的是（）。

A.PaO₂降低，PaCO₂升高

B.PaO₂正常，PaCO₂升高

C.PaO₂升高，PaCO₂正常

D.PaO₂升高，PaCO₂升高

E.PaO₂正常，PaCO₂降低

单击命令按钮时，下列程序段的执行结果为( )。 Private Sub Command1_Click() Dim a As Integer, b As Integer, c As Integer a-2:b=4:c=6 Call S1(a, b) Print "a="; a; "b="; b; "c="; c Call S2(a, b) Print "a ="; a; "b="; b; "c="; c; End Sub Private Sub S1(x As Integer, y As Integer) Dim c As Integer x=2*x:y=y+2:c=x+y End Sub Sub S2(x As Integer, ByVal y As Integer) Dim e As Integer x=2*x:y=y+2:e=x+y End Sub

A．a=4 b=6 c=6 a=4 b=6 c=6

B．a=8 b=6 c=6 a=8 b=6 c=6

C．a=4 b=6 c=6 a=8 b=6 c=6

D．a=8 b=6 c=6 a=4 b=6 c=6