下列哪项不属于孕期监护的内容

A．对胎盘功能的监测
B．对胎儿的监护
C．对胎儿成熟度的监测
D．对孕妇的定期产检
E．对孕妇工作及居住环境的监测

____is certain is ___prevention is more important than treatment .

A．It;that

B．What;that

C．As;what

D．What;what