题目

No one can________great achievements unless he concentrates on what he is doing，even though a talent. A．attain                            B．attract C．apply                             D．require 答案：A6．把一个底面直径为6.28厘米、高为3厘米的圆柱形橡皮泥，捏成底面半径为3.14厘米的圆锥，这个圆锥的高是9厘米．