沥青混凝土面层和沥青碎(砾)石面层的中线平面偏位用经纬仪进行检测，每200m测( )点。
A．1
B．2
C．3
D．4
参考答案：D
20022-2001×2003=______；已知xa=3，xb=5，则x3a-2b=______．
—Why is the woman worried?
— she lost her son.
A. So
B. Since
C. Because
D. For
