In English, bound roots are either Latin or Greek. Although they

In English, bound roots are either Latin or Greek. Although they are ( )in number,  their productive power is amazing.
【正确答案】：LIMITED
【题目解析】：本题考查bound roots（粘附词根）的特点。bound roots（粘附词根）的特点：数量有限（limited in number），生产能力惊人。故答案为limted。