He ______ naughty then.[ ]
A. wasn't
B. weren't
C. doesn't
答案:A
合理选择划线基准,是提高划线质量和效率的关键。
鼻出血时采用腭大孔注射法止血主要是封闭()
A.上颌动脉
B.鼻腭动脉
C.蝶腭动脉
D.上唇动脉
E.筛前动脉