——Do you think Jack is going to watch a football match this weekend?

—— ＿＿＿＿＿.

A．I believe not

B．I believe not so

C．I don’t believe it

D．I don’t believe

重度二尖瓣狭窄是指二尖瓣瓣口面积 ( )

A．＜2cm²
B．1～2cm^{2
C．＜1cm2
D．1～1.5cm2
E．＜3cm2}