（）的结果是合同履行的指导性文件。
A.合同体系分析
B.合同交底分析
C.合同总体分析
D.合同详细分析
参考答案：C
Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtually disappeared from the United States.
A．surfaced with
B．raised the price of
C．discovered
D．elevated
男，3岁，先天性心脏病，无发绀，来院就诊。胸部X线检查：左心室增大，肺动脉段突出，肺血流增多，有毛细血管搏动征。
此患儿的诊断最可能是（）
A.房间隔缺损
B.室间隔缺损
C.动脉导管未闭
D.法洛四联症
E.肺动脉瓣狭窄
