解析　推理判断题。由“Infants in their first six months can tell the difference between two monkey faces that an older person would say are identical，”可知。

　　答案　C

　　50．What is the writer's attitude in writing this passage?

　　A．Supportive.

　　B．Defensive.

　　C．Objective.

　　D．Persuasive.

　　解析　推理判断题。本文是一篇科普性文章，作者“客观”地描述了研究发现的结果。因此答案为C。

　　答案　C

　　E

　　Why play games？Because they are fun，and a lot more besides.Following the rules...planning your next move...acting as a team member...these are all“game”ideas that you will come across throughout your life.

　　Think about some of the games you played as a young child，such as rope­jumping and hide­and­seek.Such games are entertaining and fun.But perhaps more importantly，they_translate_life_into_exciting_dramas that teach children some of the basic rules they will be expected to follow the rest of their lives，such as taking turns and cooperating(合作)．

　　Many children's games have a practical side.Children around the world play games that prepare them for work they will do as grown­ups.For instance，some Saudi Arabian children play a game called bones，which sharpens the hand­eye coordination(协调)needed in hunting.

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