My mother is ill. I __________ stay at home to take care of her.[ ]

A. can

B. may

C. should

D. maybe

黄牛，瘤胃臌气，食欲时好时坏，体况不良，磨牙。粪便呈糊状，量减少。不见反刍，偶尔出现逆呕。喜站在斜坡上，呈前高后低姿势。该牛最可能患（）

A.腹壁疝

B.腹股沟阴囊疝

C.前胃弛缓

D.膈疝

E.瓣胃阻塞