．推理判断题。B、D两项文中未提及；根据倒数第二段“of the younger children who were not spanked were five points higher than those who were”和最后一段“the more they are spanked, the slower their mental development”可知，惩罚不利于孩子的身心发展，排除C；根据第二段“adults are much more cooperative if they work in a system based on rewards”和第六段“five points higher than those who were”可知，奖励能够促进合作，而惩罚不利于孩子心智的发展，只有A项与奖励有关，故选A。Part of a research study，by scientists at McMaster university，which is ongoing into the influence of drinking milk after heavy weightlifting，has observed that milk helps exercisers burn more fat.

　　The scientists took three groups of young men 18 to 30 years of age,56 in total，and put them through a strict，five­day­per­week weightlifting program over a 12­week period.Following their workouts，study participants drank either two cups of skim milk (脱脂奶)，or a soy beverage with equivalent amounts of protein and energy，or a carbohydrate beverage (碳酸饮料) with an equivalent amount of energy.

　　Upon the study’s conclusion，scientists observed that：the milk drinking group had lost nearly twice as much fat—two pounds—as those in the carbohydrate beverage group，who lost one pound of fat.Those drinking soy lost no fat.At the same time，the gain in muscle was much greater among the milk drinkers than either the soy or carbohydrate beverage participants.

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