1877年，在台湾架设电报线，成为中国人自办有线电报开端的福建巡抚是[ ]
A．丁日昌
B．刘铭传
C．李鸿章
D．左宗棠
答案：A
The mayor of Beijing says that all construction work for the Beijing Olympics ____ by 2006.
A．has been completed
B．has completed
C．will have been completed
D．will have completed
人类唾液中变异链球菌可检测出的浓度平均为（）。
A.103CFU/ml
B.104CFU/ml
C.105CFU/ml
D.106CFU/ml
E.107CFU/ml
