The nurse is caring for a neonate with congenital clubfoot. The child has a cast to correct the defect. Before discharge, what should the nurse tell the parents ？（）

A．"The cast will be removed in 6 weeks. "

B．"A new cast is needed every 1 to 2 weeks. "

C．"A short leg cast is applied when the baby is ready to walk. "

D．"The cast will be removed when the baby begins to crawl. "

男性，69岁。1年来反复发作胸骨后疼痛，发作和劳累关系不大，常在面迎冷风疾行时或凌晨5时发作。发作时含硝酸甘油可缓解。平时心电图示Ⅱ、Ⅲ、aVF导联ST段水平压低0.75ml。发作时心电图正常。最可能的诊断是（）

A.急性心肌梗死极早期

B.心绞痛合并心包炎

C.劳力型心绞痛

D.卧位型心绞痛

E.变异型心绞痛