阵发性室上性心动过速的药物治疗，应首选（）
A.普鲁卡因
B.腺苷
C.普罗帕酮
D.西地兰
E.胺碘酮
参考答案：B
The discovery of new evidence led to ______.[ ]
A. the thief having caught
B. caught the thief
C. the thief's being caught
D. the thief to be caught
在前100个自然数中有25个质数，那么合数的个数有（ ）
A．73
B．74
C．75
D．76
