题目

Can you speak to dolphins(海豚)?         46        We interviewed a biologist and asked her what research on dolphin communication has shown. This is what she told us.  Just like dogs, cats and other mammals, dolphins communicate by using sound, vision (视觉), touch and taste.        47    Dolphins don’t have the ability to smell, but their hearing and eyesight are excellent.   We also asked Jane if dolphins have got their own language. She told us that they have and that dolphins started talking to each other from birth.             48   右图是某商店张贴的宣传标语，据此判断，该图应该张贴于：   A．甲午中日战争之后       B．中华民国初期   C．国民政府统治前期       D．改革开放新时期  .