急性前壁心肌梗死最常见的心律失常是（）
A.室性早搏及室性心动过速
B.房室传导阻滞
C.房性早搏
D.室上性心动过速
E.心房颤动
参考答案：A
So absorbed _____ in his experiment that Newton boiled his watch when he wanted to boil an egg to eat. [ ]
A. he was
B. he did
C. had he
D. was he
焦炭的准比重比烧结矿（）。
