题目

                                                 Brazil has become one of the developing world' s great successes in reducing population  growth but more by accident than design. While countries such as India have made joint efforts  to reduce birth rates, Brazil has had better result without really trying, says George Martine at  Harvard.       Brazil' s population growth rate has dropped from 2. 99% a year between 1951 and 1960 to  1.93% a year between 1981 and 1990, and Brazilian women now have only 2. 7 children on  average. Martine如图是部分食肉动物的分类系统图解，下列叙述不正确的是（　　） A、狗是由狼驯化来的，它们的亲缘关系最近B、狗和狐的共同点比狗和豹的共同点多C、犬科动物之间的共同特征比犬属动物之间的多D、种是最基本的分类单位