题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

Have you ever wondered1.children always seem to have bags of energy and never run out of steam? Researchers have discovered that children have the levels of recovery of endurance athletes. In fact, scientists say children's muscles recover from "high-intensity exercise" a lot2.(quick) than athletes. A study looked at the performance levels of children when they were cycling, and compared their fitness to 3.of athletes. Researcher Dr Sebastien Ratel suggested they 4. (find) the children used more of their aerobic metabolism and were therefore less tired during the high-intensity physical activities. The children also recovered very quickly-even faster than the well-trained adult endurance athletes.

The researchers hope that5.(they) findings will help scientists have a better6.(understand) how the human body changes with age. It could lead to advances in the fight 7. diabetes and other diseases. Dr Ratel said the research was8.(particular) important as more children were become less active. He warned: "With the diseases related to physical inactivity9.(rise), know the changes with growth that might contribute to the risk of disease. "10.is helpful for children to maintain their fitness as they grow up and play as much as they could so they remain healthy as adults.