【判断题】丹霞地貌为红色砂砾岩,在内外营力作用下发育而成的方山、奇峰、赤壁、岩洞等特殊地貌。这种地貌最早发现于广东仁化丹霞山。
【简答题】He had learned Chinese _________ he came to China.
【多选题】丹霞地貌发育在红色砂砾岩地区,为红色砂砾岩在内外营力作用下发育而成的特殊地貌,属于此种地貌的景区有( )。
【单选题】-Why are you so late,Tom? -I was on half the way when it_________to me that I had left my notebook at home,so I had to fetch it. [ ]