阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。
Grown- ups are often surprised by how well they remember something they learned as children but have never practiced ever since. A man who has not had a chance to go swimming for years can still swim as well as ever when he gets back in the water. He can get on a bicycle after many years and still ride away.
