题目

小萍用如图所示电路探究电磁铁磁性强弱与电流大小的关系。  (1)请你用笔画线帮她把电路连接完整。  (2)闭合开关，滑动变阻器的滑片P向A端移动时，电磁铁吸引       大头针的数量将变________。  (3)实验中如图所示的电流表示数为______A。  (4)请你根据如图所示小磁针静止时北极的指向画出通电螺线管       绕线。 补全对话,根据对话内容，在空白处填入适当选项，完成对话        A: Did you get your report card today, Scott?         B: _______________（1）        A: So, how did you do?        B: ________________（2）.        A: What did your history teacher say ?        B: ________________（3）        A: That’s not so gooD．How about Spanish?        B: ________________（4）        A: That’s excellent. How about science?        B: ________________（5） And she said I was lazy.        A: Oh, Scott! You’ll have to try harder at science. A．He said I could do better.    B．Oh, well, science is very harD． C．Yes, I did. D．I did well in some subjects.  E. Oh, Ms Mendoza said I was good at speaking.