__________ her son for half a month, Marcia decided to leave for Texas with the hope of finding him.

A．Not heard from

B．Having not heard from

C．Not to hear from

D．Not having heard from

患者，男，28岁，因劳累后呼吸困难伴头晕2个月来诊。查体：P76/min，规整。BP126/74mmHg，心胸比值为52%，心导管检查左室心尖部压力为188/6mmHg，左室流出道压力128/8mmHg。

体格检查可能发现

A．心尖部3/6级收缩期杂音

B．胸骨左缘第3肋间3/6级收缩期杂音

C．胸骨左缘第2肋间3/6级收缩期杂音

D．心尖部舒张期杂音

E．毛细血管搏动征(+)