一般抹灰构造层次中的中层的作用主要是( )。
A．与基层粘结
B．找平
C．初步找平
D．与基层粘结和初步找平
参考答案：B
They have been told that if they want to build a highway between the two towns, they should first try to____ how much it is going to cost.
A．ignore
B．determine
C．realize
D．recongnize.
