两栖动物具颈椎_（31）____枚，颌始见于__（32）_纲。
参考答案：（31）一、（32）软骨鱼；
位于黄河流域的两个自治区是____________和_____________。
What would you do if you _ a million dollars in the lottery ( * * )? [ ]
A. win
B. will win
C. won
D. are winning
