题目

如图所示，通电螺线管的右端是    极（填“S”或“N”）；电源的右端是     极（填“正”或“负”）。 答案：S  正解析:略—The skirt looks different from the others and it’s really nice. —Thanks. It _________ by my mother last month. A. made B. is made  C. has been made    D. was made