( )是所有建筑平面图中首先绘制的一张图。
A．底层平面图
B．顶层平面图
C．屋顶平面图
D．局部平面图
参考答案：A
x=5b-2b，b和x成______比例．
Growing economic problems were highlighted by a slowdown in oil output.
A．accounted for
B．worked out
C．made prominent
D．taken for granted
