双重编码说认为人类在记忆历程中有哪两种代码系统？（）
A.表象系统
B.知觉系统
C.言语系统
D.情绪系统
参考答案：A, C
简述高速公路中间带的功能。
Everyone at the meeting agreed to the suggestion _______ a new bridge _______ built across the river.
A．that; have been
B．which; would be
C．as; should be
D．that; be
