患者于夜间睡眠中出现胸痛，持续10～15分钟，含服硝酸甘油疗效不佳，胸痛发作时心电图示一过性ST段抬高，血清心肌酶正常，最可能的诊断为（）

A.结核性胸膜炎

B.急性心肌梗死

C.变异型心绞痛

D.急性肺栓塞

E.心包炎

It is reported that between the year 1550 and 1950 about one kind of living things___each year .

A．died out

B．died of

C．died from

D．died down