本科生第二课堂活动实行学分化管理，要求全校非医学类专业本科生在校期间至少获得几个学分（）
A.5个
B.2个
C.4个
D.3个
参考答案：B
He gave his life to ________ Chinese soldiers.
A．help
B．helping
C．for helping
D．helps
