A number of studies suggest that unstructured（无条理的）play can help children become creative, discover their own interests, develop problem-solving abilities, and relate to others socially, according to a report prepared by two academy committees for release Monday at the group’s annual meting. On the contrary, a lack of such playtime can create stress for both children and parents, and it can also cause obesity（肥胖）when children spend too much time sitting in front of educational videos. The report notes lack of playtime could even lead to depression in many children.

（Natural News）Many parents have tried to gave their children a head start on education with get-smart videos and enrichment activities as early as infancy, but free play is often sacrificed, so the American Academy of Pediatrics says that the best medicine for busy children is an increase in traditional “playtime”.

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55. A. cases                  B. order                C. list                    D. orphanage

54. A. confused             B. associated          C. combined          D. compared

53. A. pity                    B. happy               C. curious              D. eager

52. A. out                            B. over                  C. for                    D. on

51. A. preparation         B. pleasure            C. satisfaction        C. wonder