原料在装卸、运输过程中出现混料的原因是（）。
A、设备问题
B、操作问题
C、原料问题
参考答案：B
看图完成答句，一空一词。
1. Where are the boys?
They are ______ the ______.
2.What are one group of the boys doing?
They are______.
3.What are the other group of boys doing?
They are ______.
4.Where are the three students standing?
They are standing ______ a big ______.
5.What are they doing?
They're ______ the basketball ______.
行为主义学派的主张是一种典型的( )的观点。
A．遗传决定B．环境决定C．遗传与环境交互作用D．辩证唯物主义
