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1 Compared with conventional beef, grass-fed beef is higher in this health-promoting nutrient, which gives its fat a yellow color: 1、与传统牛肉相比，草饲牛肉中某种有益健康的营养素含量更高，并让脂肪呈现黄色，这种营养素是： Vitamin A 维生素A Vitamin B 维生素B Vitamin C 维生素C Vitamin D 维生素D 2 Researchers found that having an “ambivalent” marriage, in which feelings of support from a partner waver, could jeopardize health. What percentage of couples they surveyed had ambivalent marriages? 2、研究人员发现，如果你的婚姻属于“矛盾型”，你感觉配偶对自己的支持时高时低，那么你的健康可能会因此受损。在接受调查的夫妇中，“矛盾”婚姻的百分比有多高？ 23 percent 23% 45 percent 45% 59 percent 59% 77 percent 77% 3 A large analysis found that birth order had an effect on which of the following traits? 3、一项大型分析发现，出生顺序对以下哪方面产生了影响？ Extroversion 外向程度 Consientiousness 责任心 IQ 智商 All of the above 以上所有 4 Exercise, particularly during midlife, may slow cell aging by preventing the fraying of this part of the chromosome: | 
