在右心导管检查中不常见的心律失常（）
A.室性期前收缩
B.房性期前收缩
C.房性心动过速
D.心房颤动
E.房室传导阻滞
参考答案：E
左上后牙牙龈肿痛2天，查见左上第一磨牙颊侧牙龈卵圆形肿胀，有波动感，袋深8mm，牙髓活力正常，最可能的诊断是( )
A．急性牙槽脓肿B．急性多发性牙龈脓肿C．逆行性牙髓炎D．急性牙周脓肿E．急性根尖周炎
A．(A) If you are hungry, you’d better go to the nearest supermarket.
B．(B) Few American consumers would choose to go shopping in Wal-Mart.
C．(C) In 2006, shopping over the Internet rose by 28 percent.
D．(D) In 2005, about $14 billion of goods were bought over the Internet.
