如图所示，在观察奥斯特实验时，小明注意到置于通电直导线下方小磁针的N极向纸内偏转。该实验探究的是通电直导线周围是否存在____ 。实验中小磁针的作用是检测磁场的存在，这里用到的一种重要的科学研究方法是____ 法（选填“类比”、“转换”、“控制变量”或“等效替代”）。小明推测：若一束电子沿着水平方向平行地飞过磁针上方时，小磁针也将发生偏转。请你说出小明推测的依据是：____ ，这时磁针的N极会向____ (选填“纸内”或“纸外”)偏转。

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1).每处错误及其修改均仅限一词；

2).只允许修改10处，多者（从第11处起）不计分。

    Once there had a wooden pagoda（塔）in my village. It had a history of over eight hundreds years. It was such beautiful and famous that many tourists came to visit it every year. They took photos, write down their names on the walls and even threw rubbishes everywhere.

    Later the pagoda was destroyed because of a fire in the forest nearby it. The villagers had to spend a great deal of money build another pagoda, that looked like the old one. Now not only the villagers realize the importance of protecting the pagoda but also tourists know that they should try his best not to cause damage to it.