【正确答案】 A

【答案解析】A new research shows that as children grow they become less active. Even the most active children experience dramatic declines in physical activity as they hit teen years. That is to say, young children move a lot, they seldom keep quiet, so they do more exercise than the elder. Meanwhile, young children eat a wide range of food, and they have fewer over-weight problems. Because as children grow older, they have access to make their own choices to eat, some of them only eat what they like. In one word, children should eat a wide range of food and do more exercise to keep growing well.

【正确答案】 B