下列哪种先天性心脏病可出现原发性左心衰竭
A．法洛四联症
B．动脉导管未闭
C．房间隔缺损
D．肺动脉瓣狭窄
E．右位心
参考答案：B
He is going to build a team that has a lot of potential and he thinks that is ____ excites him.
A．that
B．which
C．what
D．as
以下（）不是衡量程序质量的标准。
A.设计质量高
B.加工效果好
C.通用性强
D.使用指令多
