Evidence collected by the spacecraft on Mars shows some present volcanic action, though the volcanoes are believed to be dormant if not dead.

A．deceased

B．departed

C．disappeared

D．extinct

钩虫幼虫引起的临床症状主要是（）

A."粪毒"

B.嗜异食症

C.钩蚴性皮炎

D.上腹隐痛，消化不良，消瘦乏力

E.咳嗽咳痰，可伴阵发性哮喘