— Have you seen ____ pencil? I left it here this morning．

—Is it _____black one? I think I saw it somewhere

A．a; the

B．the; the

C．the; a

D．a; a

肥厚型心肌病人心电图出现病理性Q波是由于（）

A.心肌间质水肿

B.心肌缺血、坏死

C.左室肥厚、劳损

D.肥厚的室间隔除极向量增大

E.心肌过度肥厚引起心肌缺血