题目

The story goes that some time ago, a man punished his 3-year-old daughter for wasting a roll of gold wrapping paper. Money was tight and he became infuriated(愤怒的) when the child tried to decorate a box to put under the Christmas tree. Nevertheless, the little girl brought the gift to her father the next morning and said, This is for you, Daddy. The man was embarrassed by his earlier overreaction, but his anger flared again when he found out the box was empty. He yelled at her, stating, Don't you know, when you give someone a present, there is supposed to be something inside? The little 如图所示是最早的磁性指向器——司南，司南能指南北的原因是（   ）A．太阳周围有磁场B．月球周围有磁场C．地球周圈有磁场D．地球内部有根条形磁铁