题干
下列的四幅图，对应的说法正确的是（ ）
A：如图，通电导线周围存在着磁场，将小磁针移走，该磁场消失
B：如图，闭合开关，通电螺线管右端为N极
C：如图，闭合开关，保持电流方向不变，对调磁体的N、S极，导体的运动方向不变
D：如图，闭合开关，只要导体在磁场中运动，电路中就一定会有感应电流
答案(点此获取答案解析）
B
at 6:30 in the morning. I 
at home. Then I 
at 7:10. I
at 7:30. I 
at 11:45. In the afternoon, we 
class. After school, I 
with my friends. In the evening, I 
or 
. I
at 9:00. This is my day.