急性心包炎胸痛的特点是（）
A.前俯位时加重
B.前俯位时减轻
C.深呼吸时减轻
D.疼痛不放射到其他部位
E.随渗液量增多而加重
参考答案：B
1千克鹅毛和1000克的石头一样重。[ ]
Mary did her homework ______, so she left school early.[A] slow [B] happy [C] quickly
