单项选择题A.To limit discussion on heating bills.B.To prevent unnecessary heat loss.C.To control the temperature in the houses.D.To decrease the cost of energy-using.
单项选择题A.The sooner children begin to learn gardening, the better.B.Gardening teaches children to make their thumbs green.C.Gardening provides children with food.D.Gardening teaches children to cooperate.