John ___________ to the park yesterday. [ ]
A. goes
B. going
C. went
答案：C
底面半径为2的圆锥被过高的中点且平行于底面的平面所截，则截面圆的面积为 ______．
驱虫药宜
A．及时服B．饭前服C．清晨空腹服或睡前服D．睡前1～2h服E．晚上服用
