题目

Could you tell us ______________ around the earth?        A. if does the moon go            B. if the moon goes        C. that the moon went            D. that does the moon go 答案：B若双曲线的一个焦点到一条渐近线的距离等于焦距的,则该双曲线的渐近线方程是（   ） A.      B.      C.    D.