A．紫外线
B．红外线
C．可见光
D．无线电波
答案：D
Look! A dog ________ on the road. You should drive your car carefully.
A．lie
B．lies
C．lying
D．is lying
石的泥块含量是指砂中公称粒径大于（）㎜，经水洗、手捏后变成小于2.50㎜的颗粒的含量。
A.5.00
B.2.50
C.1.25
D.0.630
