It took         building supplies to construct these energy-saving houses. It took brains, too.

A．other than

B．more than

C．rather than

D．less than

患者王某，男，65岁，因肺心病收住院治疗，护士巡视病房时，发现病人口唇紫绀，并伴有明显三凹征，血气分析结果显示：PaO24.6kPa，SaO250%。根据病人症状及血气分析结果，判断其缺氧程度为

A．过重度

B．轻度

C．重度

D．中度

E．极轻度