The dog has always been considered man′s best friend.Always noted for being particularly?faithful in watching over children,he also has his place by the fireside,in the cow pasture,on the?sheep range(放牧区),and beside the hunter in forest.He is easy to train,works hard,and often?performs astonishing feats.And in the frozen polar regions he was once the principal motive power,before being lately displaced by the plane and helicopter.
Because he howls or whines in the presence of impending death,the dog was once thought to?have supernatural powers and believed to be capable of seeing gods and ghosts invisible to men.Actually,the.basis for these beliefs lies in the hound′s sensibility to people′s feelings and his superior?hearing ability and sense of smell,which enable him to detect signs hidden from human observation.His record of saving lives is outstanding,for he often gives warning of fire and other dangers not noticed by his master.
The dog′s major contribution,however,has been to medical research.Both his diet and his?structure are comparable to those of the human being,and so he has been the subject Of countless?demonstrations and experiments.Open-heart surgery has been made possible largely because of the?dog.But his sacrifice has repaid his own species as well by safeguarding it from rabies(狂犬病),distemper,and other diseases.
Dogs are similar to human beings in__________.
【考情点拨】事实细节题。【应试指导】文章第三段第二句前半句指出，狗
的饮食和身体结构与人类很接近。
我国独立自主的外交政策体现在哪些方面？我国为什么必须实行对外开放？
简述人民民主专政理论的基本内容。
简述走农村包围城市，武装夺取政权道路的必要性。
简述实践及其对认识的决定作用。
遵义会议集中解决了党的政治路线问题。
生产方式是社会发展的决定力量。
对外开放是我国的一项长期的基本国策，实行这一国策的前提和基础是（ ）
计划和市场是（ ）
加强党的自身建设，必须放在首位的是（ ）
中国共产党的立党之本、执政之基、力量之源是（ ）
