—What's the matter with you
—After the long walk, my leg （）and I couldn't go any further.

A. gave out

B. gave off

C. gave in

D. gave up

某猪场4～5月龄架子猪1月份突然发病，T41．0度左右，不食，精神沉郁，喜卧不愿走动，强行驱赶尖叫，呼吸加快，腹式呼吸明显，鼻腔有浆液性的分泌物，眼分泌物多，很少死亡，该病可能是（）

A.猪肺疫

B.猪丹毒

C.猪流感