The reason      he was late for school was      he had to send his mother to a hospital.

A．which; that

B．why; that

C．for which; because

D．what; why

男，27岁，劳动时常有胸闷、气短等症状，有时突然站起时会发生眩晕，甚至神志丧失，查体：胸骨左缘第3～4肋间闻及Ⅲ级粗糙的喷射性收缩期杂音，超声心动图示室间隔肥厚，应考虑为

A．冠状动脉粥样硬化性心脏病伴心绞痛

B．急性心肌梗死

C．主动脉瓣狭窄

D．高血压性心脏病

E．肥厚型梗阻性心肌病