A:垂直于磁感线向左运动
B:平行于磁感线向上运动
C:平行于磁感线向下运动
D:保持静止
— His jokes made him a silly person.
— I don't think so. He is a funny man.
--What do you usually do after school?--I usually play ________ basketball with my friends.
有“黄金水道”之称的是( )