Is this your backpack? Please _____ Alan.[ ]
A. call
B. spell
C. watch
答案：A
Hearing his father was seriously ill, ______.
A．he burst into tears
B．his eyes were filled with tears
C．his face lost its colour
D．tears came to his eyes
相对收入假说认为，消费习惯形成之后具有不可逆性，从而消费本身也具有不可逆性，这种不可逆性就是“棘轮效应”
