题目

. Some animals are in danger, and the scientists are doing ___ they can ___ them.   A. that; to save   B. whatever; to save    C. what; save    D. the thing; save 答案：B如图，平行四边形ABCD中，过点B的直线与对角线AC、边AD分别交于点E和F．过点E作EG∥BC，交AB于G，则图中相似三角形有（　　） A．4对                   B．5对                  C．6对                  D．7对