引起心绞痛与急性心肌梗死疼痛的原因是（）。

A.挤压

B.出血

C.坏死

D.扩张

E.缺血

Many people felt it was a pity that the ancient tower was       and a modern building was being built. [     ]

A.pulled off

B.pulled down

C.pulled up

D.pulled in