A:I hear a sheep. Baa, baa.
B:I hear a duck. Quack, quack.
A. in front of B. over C. beside D. behind E. between
双曲线x24-y2=1的渐近线方程为( )
____ + ____ = ____
想: ____个十加____个十是____个十.
黄冈的支柱产业,下列农产品中属于果实的是( )