[答案]
(1)less.(2)aboutfive.(3)ten.(4)playoutdoors.(5)important.
[解析]
(1)less.细节理解题。根据Modern children play outdoors just half as much as their parents did when they were young,现代儿童在户外玩耍的时间只有他们父母年轻时的一半,比他们父母年轻时少。
(2)about five.细节理解题。根据Children spend about five hours playing outdoors during weekdays,周末大约四个小时。故答案为:about five。
(3)ten.细节理解题。根据Only one in ten children would like to go outdoors for exercise.只有十分之一的孩子喜欢到户外运动。故答案为:ten。
(4)play outdoors.词义猜测题。根据划线词所在句的前一句:In fact,对孩子们来说。结合划线词所在句句意:它可以帮助他们保持活跃和健康。故答案为:play outdoors。
(5)important.细节理解题。根据In fact it is more important for children to play outdoors than to be at home to have fun.事实上。可知作者认为孩子们在户外玩很重要。
[点评]
本题考查了"人与社会   细节理解   词句猜测   ",属于"难典题",熟悉题型是解题的关键。