马克思主义的三个来源是（）。
A.德国古典哲学
B.英国古典政治经济学
C.法国空想社会主义
D.达尔文进化论
E.法国的唯物主义
参考答案：A, B, C
— Why don't you ask him for help? You be good friends.
— We have disagreements and we haven't talked to each other for a long time. [ ]
A. are used to
B. are used as
C. used to
D. are used for
IEEE 802.2定义的是局域网中的( )协议规范。
A．网络层
B．数据链路层
C．物理层
D．逻辑链路控制层
