用户迁址，须在（）前向供电企业提出申请。
A.三天
B.十天
C.五天
D.十五天
参考答案：C
（）年，我国颁布了《中华人民共和国环境保护法（试行）》，明确了环境标准的制（修）订、审批和实施权限，使环境标准工作从此有了法律依据和保障。
A.1973
B.1979
C.1980
D.1981
--They were ________ busy ________ with each other ________ the time.
--- How cool the guys are !
A．too; to talk; to forget
B．too; talking; to forget
C．so; to talk; that they forgot
D．so; talking; that they forgot
