My sister doesn't like bread. She won't eat it _____ she is very hungry.             [ ]

A. if      

B. when    

C. as      

D. unless

咳嗽咯血，潮热，面色苍白，盗汗，倦怠乏力。食少，舌质红，苔剥，脉细数无力，应首先考虑的是

A．气阴两虚型肺痨

B．肺阴亏虚型肺痨

C．阴阳两虚型肺痨

D．阴虚火旺型肺痨

E．以上都不是