题目

    In Denmark, parents are allowed to set up a new school if they are dissatisfied with the school in the area where they are living. Although these schools have to follow the national courses, they are allowed a lot of choice in deciding what to teach. Some of these new schools are called “small schools” because usually the number of pupils in them is only sixty, but a school has to have at least twenty-seven pupils.     Cooleenbridge School in Ireland, is a small school similar to the ones in Denmark, it was set up by parents who came from Holland, Germany, Czechoslovakia, England已知为等比数列，，则（   ） A．　　　B．　　C．　　　D．16