A-A+
The rats fed unrestricted diets do NOT ______A
问题详情
The rats fed unrestricted diets do NOT ______
A．have one preventing-aging protein increased
B．have their cell death increased or doubled
C．have their DNA fragmentation doubled
D．have the levels of proteins increased
参考答案
正确答案：A
解析：本题是细节题。在研究比较两类老鼠的段落里Another protein thought to protect from cell death dropped by 60% in the well-fed rats。原文是一种防止衰老的蛋白质大大减少了，而选项A最接近答案，是没有增加那种防止衰老的蛋白质。其他选项是已经发生的事实。
