入射光线与平面镜的夹角是55°,保持入射光线不动,绕入射点转动面镜,使入射角增大10°,则反射光线跟入射光线的夹角是[ ]
A.50°
B.70°
C.90°
D.130°
答案:C
My good friend is leaving for his hometown . I’m going to ________ .
A.see him off
B.see off him
C. see about him
D.see him out
我国少数民族中,人数最多的民族是
A.蒙古族
B.藏族
C.满族
D.壮族