不经常使用的起重机的利用等级应该为( )。
A．U0～U3
B．U4～U5
C．U6
D．U7～U9
参考答案：A
On the graduation day, he received from his father a nice present ______ a note was attached, saying “I’m proud of you.”
A．on which
B．to which
C．with which
D．in which
下图中政府的举措有利于公民行使[ ]
A．选举权
B．决策权
C．监督权
D．管理权
