He ____ cartoons ____ the weekends. [ ]
A. watch; on
B. watches; in
C. watches; at
答案:C
如何调控中学业余运动训练的负荷阈
端坐位可减轻左心衰竭引起的呼吸困难的原因是
A.减轻门静脉淤血B.减轻下腔静脉淤血C.减轻上腔静脉淤血D.减轻肠系膜静脉淤血E.减轻肺淤血