We had great fun _____ in the park. [ ]
A. play
B. plays
C. playing
D. Played
答案:C
圆的半径由6厘米增加到8厘米,圆的面积增加了( )平方厘米。
治疗眩晕的基本处方用穴有
A.风池
B.百会
C.尺泽
D.太阳
E.绝骨