一个不透明的盒子中装有除颜色外部相同的20个小球．从中每次摸出一个球，记下颜色，再放回，如此反复，经多次摸取后，发现摸出红色小球的频率大约为40%，则盒子中红球的个数应为____ 个．

阅读理解

B

      A father sat at his desk thinking of his poor family life when his young son ran in and said happily, “Dad, because this is your birthday and you’re 50 years old, I’m going to give you 50 kisses, one for each year!” But the father said, “Oh, Andrew, don’t do it now. I’m too busy!” Hearing this, the boy said nothing as tears (眼泪) ran down in his big blue eyes. The father felt sorry for his son, and then he said, “You can finish later.”

      The boy walked away, with disappointment on his face. That evening the father said, “Come and finish the kisses now, Andrew!” But the boy didn’t answer.

      Unluckily, a few days later, the boy had an accident (事故) and left his father forever.

      Love is a two-way street. We must warmly accept (接受) any loving act, or we will feel sorry.