The structure of this animal's brain gives no______that it is any more intelligent than others.
【正确答案】 C
【答案解析】各项的意思是：indication指示，表示；index索引，标志；hint暗示，示意(give no hint that没有显示／表明……)；implication含义，暗示；暗指。据句意判断，答案为C。